Common Weakness Enumeration
CWE-59
AllowedImproper Link Resolution Before File Access ('Link Following')
Abstraction: Base · Status: Draft
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
2302 vulnerabilities reference this CWE, most recent first.
CVE-2026-82049 (GCVE-0-2026-82049)
Vulnerability from cvelistv5 – Published: 2026-09-14 19:14 – Updated: 2026-10-02 00:35
VLAI
EPSS
VEX
Title
tarfile extraction filters allow file modification and content disclosure via hard link to symlink
Summary
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 00:00 UTC
CWE
Assigner
References
11 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.22
(python)
Affected: 3.11.0 , < 3.11.17 (python) Affected: 3.12.0 , < 3.12.15 (python) Affected: 3.13.0 , < 3.13.16 (python) Affected: 3.14.0a1 , < 3.14.0b1 (python) |
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CVE-2026-81963 (GCVE-0-2026-81963)
Vulnerability from cvelistv5 – Published: 2026-09-08 17:19 – Updated: 2026-10-01 23:00
VLAI
EPSS
VEX
Title
Windows Update Stack Elevation of Privilege Vulnerability
Summary
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-07 00:00 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 11 version 23H2 |
Affected:
10.0.22631.0 , < 10.0.22631.7582
(custom)
|
|
| Microsoft | Windows 11 Version 23H2 |
Affected:
10.0.22631.0 , < 10.0.22631.7582
(custom)
|
|
| Microsoft | Windows 11 Version 24H2 |
Affected:
10.0.26100.0 , < 10.0.26100.9445
(custom)
|
|
| Microsoft | Windows 11 Version 25H2 |
Affected:
10.0.26200.0 , < 10.0.26200.9445
(custom)
|
|
| Microsoft | Windows 11 version 26H1 |
Affected:
10.0.28000.0 , < 10.0.28000.2954
(custom)
|
|
| Microsoft | Windows Server 2025 |
Affected:
10.0.26100.0 , < 10.0.26100.33438
(custom)
|
|
| Microsoft | Windows Server 2025 (Server Core installation) |
Affected:
10.0.26100.0 , < 10.0.26100.33438
(custom)
|
Date Public
2026-09-08 14:00
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CVE-2026-81727 (GCVE-0-2026-81727)
Vulnerability from cvelistv5 – Published: 2026-08-27 14:51 – Updated: 2026-08-27 17:43
VLAI
EPSS
VEX
Title
NLTK before 3.10.3 Hardlink File Overwrite via downloader
Summary
NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download and Downloader.incr_download methods that allows attackers to overwrite files outside the install root through pre-existing hardlinks. Attackers with write access to a shared downloader directory can create hardlinks pointing to outside-root files that are then overwritten during normal package extraction, mutating files outside the intended install tree.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 17:43 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/nltk/nltk/security/advisories/… | vendor-advisory |
| https://www.vulncheck.com/advisories/nltk-before-… | third-party-advisory |
Impacted products
Date Public
2026-08-12 00:00
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CVE-2026-81690 (GCVE-0-2026-81690)
Vulnerability from cvelistv5 – Published: 2026-08-27 14:50 – Updated: 2026-10-01 15:21
VLAI
EPSS
VEX
Title
verify-usb before 1.4.9 Symlink Directory Traversal Code Execution
Summary
openssl-encrypt (pip package) before 1.4.9 contains a symlink-following flaw in its verify-usb v2 added-file allowlist scan. The scan enumerated the drive with rglob(), which in CPython does not descend into symlinked directories and treats the symlink as an ordinary directory, while O_NOFOLLOW on the hash side binds only the final path component. An evil-maid attacker with physical access to the removable drive could replace a tool-tree directory with a symlink to a copy containing byte-identical files plus a planted __pycache__/*.pyc file (which CPython loads in preference to recompiling the clean .py). The planted file is never enumerated, added_files stays 0, and verify-usb reports PASSED, resulting in code execution when the victim runs the portable install. Fixed in 1.4.9 (affects both 1.4.x and 1.5.x lines).
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 19:25 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/verify-usb-b… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.9
(semver)
Unaffected: 1.4.9 (semver) cpe:2.3:a:jahlives:openssl_encrypt:*:*:*:*:*:*:*:* |
Date Public
2026-08-12 00:00
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CVE-2026-81572 (GCVE-0-2026-81572)
Vulnerability from cvelistv5 – Published: 2026-08-27 07:06 – Updated: 2026-08-28 16:52
VLAI
EPSS
VEX
Title
Local Privilege Escalation in CodeMeter Runtime on Windows
Summary
In CodeMeter Runtime from version 8.40 to (excluding) 8.41a and 9.00 to (excluding) 9.10, cmu.exe --create-io --file C: creates a predictable temporary file under C:\CM-Stick. The directory and
file paths are not properly checked for NTFS reparse points, such as junctions or symbolic links, before file
operations are performed. A local attacker can create a junction at the temporary file that points to an arbitrary
system path. Because CodeMeter Runtime runs with System privileges, this could allow arbitrary files to be deleted
with System privileges and potentially enable local privilege escalation.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 03:55 UTC
CWE
- CWE-59 - Improper link resolution before file access ('link following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://cdn.wibu.com/fileadmin/wibu_downloads/sec… | vendor-advisory |
| https://shelltrail.com/research/local-privilege-e… | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| wibu-systems-ag | codemeter-runtime |
Affected:
8.40 , < 8.41a
(custom)
Affected: 9.00 , < 9.10 (custom) cpe:2.3:a:wibu-systems-ag:codemeter-runtime:*:*:windows:*:*:*:*:* cpe:2.3:a:wibu-systems-ag:codemeter-runtime:*:*:windows:*:*:*:*:* |
Date Public
2026-08-25 13:00
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CVE-2026-81310 (GCVE-0-2026-81310)
Vulnerability from cvelistv5 – Published: 2026-09-30 01:51 – Updated: 2026-09-30 16:57
VLAI
EPSS
VEX
Summary
Image Scanner Driver for Linux contains a link following vulnerability. An attacker who can log in to a Linux system where the product is installed may overwrite arbitrary files by using a special method in advance.
Severity
6.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 16:57 UTC
CWE
- CWE-59 - Improper link resolution before file access ('Link Following')
Assigner
References
2 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| PFU Limited | Image Scanner Driver for Linux (fi Series) |
Affected:
2.0.0
Affected: 2.1.0 , ≤ 2.1.1 (semver) Affected: 2.3.2 Affected: 2.5.0 Affected: 2.7.0 , ≤ 2.7.1 (semver) Affected: 2.8.0 , ≤ 2.8.2 (semver) |
|
| PFU Limited | Image Scanner Driver for Linux (SP Series) |
Affected:
2.0.0
Affected: 2.1.0 , ≤ 2.1.1-4 (semver) Affected: 2.2.0 , ≤ 2.2.2 (semver) Affected: 2.3.0 |
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CVE-2026-80430 (GCVE-0-2026-80430)
Vulnerability from cvelistv5 – Published: 2026-09-25 13:08 – Updated: 2026-09-25 15:29 X_Open Source
VLAI
EPSS
VEX
Title
Improper link resolution in the kitty drag and drop protocol allows a client to create files outside the staging directory
Summary
Improper Link Resolution Before File Access in the drag source staging path of the drag and drop protocol in kitty from 0.47.0 before 0.49.0 allows a program writing to the terminal to create files and directories at paths outside the staging directory, because subdir_data_for_drag() in kitty/dnd.c resolves a descendant of the staged item tree by constructing a path string and opening it with safe_open(path, O_DIRECTORY | O_RDONLY, 0) rather than by walking the tree one component at a time, so a client that declares two entries with the same name, the first a symlink whose target is an arbitrary absolute path and the second a directory, causes mkdirat() to fail with EEXIST, which the code ignores, and causes the subsequent path resolution to follow the symlink and return a directory descriptor outside the staging directory, which is then passed as the dirfd argument to add_payload() and used for every further create operation on that item and its descendants. Entry names are sanitised against path separators and dot components, but symlink targets are not validated. Files are created with O_CREAT | O_WRONLY | O_EXCL at mode 0644, so existing files cannot be overwritten, and directories are created with mkdirat() at mode 0755, so the attacker can create intermediate directories that did not previously exist. This results in the creation of files and directories at any path writable by the user running kitty, provided the symlink target is an existing directory.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 15:27 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/kovidgoyal/kitty/commit/554908… | patch |
| https://github.com/kovidgoyal/kitty/commit/3c3133… | related |
| https://github.com/kovidgoyal/kitty/releases/tag/… | release-notes |
| https://secur0.com/en/cna/cve-list/cve-2026-80430… | third-party-advisorytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kovid Goyal | kitty |
Affected:
0.47.0 , < 0.49.0
(semver)
cpe:2.3:a:kovidgoyal:kitty:*:*:*:*:*:*:*:* |
Date Public
2026-09-21 04:01
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CVE-2026-79699 (GCVE-0-2026-79699)
Vulnerability from cvelistv5 – Published: 2026-09-15 16:25 – Updated: 2026-10-02 14:45
VLAI
EPSS
VEX
Title
Podman: buildah: skopeo: containers/storage: malicious tar whiteout header allows replacement of extraction destination directory
Summary
A flaw was found in the containers/storage library. A crafted tar archive containing a malicious whiteout header (e.g. victim/.wh.) can cause the extraction destination directory to be replaced with an arbitrary file when processed by storage/pkg/archive.UnpackLayer, ApplyLayer, or ApplyUncompressedLayer.
Severity
4.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 18:29 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-79699 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2523408 | issue-trackingx_refsource_REDHAT |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3
|
|
| Red Hat | Red Hat OpenShift Virtualization 4 |
cpe:/a:redhat:container_native_virtualization:4
|
|
| Red Hat | Red Hat Quay 3 |
cpe:/a:redhat:quay:3
|
Date Public
2026-09-15 00:00
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CVE-2026-79655 (GCVE-0-2026-79655)
Vulnerability from cvelistv5 – Published: 2026-08-25 13:49 – Updated: 2026-08-25 14:12
VLAI
EPSS
VEX
Title
Sos: sos: path traversal in sos clean tar extraction via unvalidated symlink/hardlink targets leads to arbitrary file write
Summary
A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.
Severity
7.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:11 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-79655 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2523363 | issue-trackingx_refsource_REDHAT |
| https://github.com/sosreport/sos/issues/4460 | |
| https://github.com/sosreport/sos/pull/4461 |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
Date Public
2026-08-21 08:00
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CVE-2026-78409 (GCVE-0-2026-78409)
Vulnerability from cvelistv5 – Published: 2026-09-02 15:11 – Updated: 2026-09-03 12:50
VLAI
EPSS
VEX
Title
Util-linux: util-linux: x-mount.subdir detached-tree resolution can escape via intermediate symlinks
Summary
The X-mount.subdir option uses a detached-tree fast path on Linux 6.15 and later and passes the configured subdirectory to open_tree() with AT_SYMLINK_NOFOLLOW. That flag does not stop intermediate symlink traversal or keep resolution inside the newly mounted filesystem. A local unprivileged user with an fstab-authorized X-mount.subdir entry can attach a host path at the intended mountpoint.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 15:29 UTC
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:63162 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-78409 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2522607 | issue-trackingx_refsource_REDHAT |
| https://github.com/util-linux/util-linux/security… |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
Unaffected:
2.42.2-3.4.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
Date Public
2026-09-02 00:00
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Mitigation MIT-48.1
Architecture and Design
Strategy: Separation of Privilege
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
CAPEC-132: Symlink Attack
An adversary positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name.
CAPEC-17: Using Malicious Files
An attack of this type exploits a system's configuration that allows an adversary to either directly access an executable file, for example through shell access; or in a possible worst case allows an adversary to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
CAPEC-35: Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.