Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

The product dereferences a pointer that it expects to be valid but is NULL.

6742 vulnerabilities reference this CWE, most recent first.

CVE-2026-57225 (GCVE-0-2026-57225)

Vulnerability from cvelistv5 – Published: 2026-09-18 20:17 – Updated: 2026-09-21 18:20
VLAI
Title
Suricata datasets: NULL pointer dereference in JSON/NDJSON dataset loading
Summary
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, src/datasets-context-json.c assumes that a configured JSON or NDJSON dataset value_key resolves to a string. A trusted or untrusted dataset or rule feed containing a non-string value for that key can cause a NULL pointer dereference during startup, configuration test mode, or rule reload, crashing Suricata before traffic processing. This issue is fixed in version 8.0.6.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 18:20 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
OISF suricata Affected: >= 8.0.0, < 8.0.6
Create a notification for this product.
Show details on NVD website

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CVE-2026-56288 (GCVE-0-2026-56288)

Vulnerability from cvelistv5 – Published: 2026-07-09 09:29 – Updated: 2026-07-09 12:57 X_Open Source
VLAI
Title
NULL Pointer Dereference in GNU patch
Summary
GNU patch is vulnerable to a NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing. An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service. This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 12:57 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
GNU patch Affected: 0 , ≤ 2.8.0 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-56168 (GCVE-0-2026-56168)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-09-25 18:24
VLAI
Title
Windows SMB Server Denial of Service Vulnerability
Summary
Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 18:00 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.7548 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.7548 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.8875 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.8875 (custom)
Create a notification for this product.
Microsoft Windows 11 version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.2525 (custom)
Create a notification for this product.
Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.5386 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.33158 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.33158 (custom)
Create a notification for this product.
Date Public
2026-07-14 14:00
Show details on NVD website

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CVE-2026-56017 (GCVE-0-2026-56017)

Vulnerability from cvelistv5 – Published: 2026-06-29 19:38 – Updated: 2026-06-29 22:24
VLAI
Title
JavaScript::Minifier::XS versions before 0.16 for Perl crash with a NULL pointer dereference when the first meaningful token of the input is a slash
Summary
JavaScript::Minifier::XS versions before 0.16 for Perl crash with a NULL pointer dereference when the first meaningful token of the input is a slash. The regexp versus division disambiguator in JsTokenizeString (XS.xs) inspects the previous token's last byte to choose between a regexp literal and a division operator. When a slash is the first meaningful token, with the start of input or only whitespace and comments before it, there is no valid preceding token: the walk back over whitespace and comment nodes runs off the head of the node list to NULL, and the byte lookup reads through a NULL contents pointer at an underflowed length index. The following identifier check dereferences the same NULL pointer. The crash is reachable through the public minify() API, so input as small as a single slash byte crashes the calling process. A service that minifies untrusted or third-party JavaScript can be crashed by a remote request, causing denial of service.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-29 20:54 UTC
CWE
Impacted products
Vendor Product Version
GTERMARS JavaScript::Minifier::XS Affected: 0 , < 0.16 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-55783 (GCVE-0-2026-55783)

Vulnerability from cvelistv5 – Published: 2026-07-10 16:48 – Updated: 2026-07-10 18:38
VLAI
Title
NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive
Summary
NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 18:38 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
M2Team NanaZip Affected: < 6.5.1749.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-55717 (GCVE-0-2026-55717)

Vulnerability from cvelistv5 – Published: 2026-07-22 13:09 – Updated: 2026-07-22 14:07
VLAI
Title
'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash
Summary
In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when 'serve-expired: yes' is set together with a 'response-ip: <net> redirect' /'response-ip-data: <net> CNAME <target>' rule (or the RPZ 'rpz-cname-override' equivalent), a remote client who controls any delegated domain can crash the daemon. The serve-expired-client-timeout callback runs a two-pass loop to chase the respip-generated CNAME alias; on the second pass it resets 'alias_rrset' but not 'partial_rep'. Later, this inconsistency leads to a NULL pointer dereference and an eventual crash. A malicious actor can exploit the vulnerability by controlling any zone that replies with an A/AAAA record that falls inside the configured response-ip/rpz subnet. By delaying the answer when the previous record has expired, the vulnerable path of 'serve-expired-client-timeout' is taken leading to denial of service via the server crash.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 14:07 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
NLnet Labs Unbound Affected: 1.10.0 , < 1.25.2 (semver)
Create a notification for this product.
Date Public
2026-07-22 00:00
Show details on NVD website

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CVE-2026-55371 (GCVE-0-2026-55371)

Vulnerability from cvelistv5 – Published: 2026-08-25 00:31 – Updated: 2026-08-25 19:22
VLAI
Title
OpenEXR: OpenEXRCore exr_attr_set_bytes() accepts NULL type_hint with positive hint_length
Summary
OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_bytes(). The public setter validates the top-level exr_attr_bytes_t value pointer but does not verify that the nested type_hint pointer is non-NULL when hint_length is greater than zero. When a caller supplies a positive hint_length together with a NULL type_hint, exr_attr_bytes_create() allocates a destination type-hint buffer and then copies from the NULL source pointer, causing a deterministic crash. The flaw is reachable through the public OpenEXRCore C API and results in a denial of service. The issue is fixed in version 3.4.13.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 18:32 UTC
CWE
  • CWE-20 - Improper Input Validation
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
AcademySoftwareFoundation openexr Affected: >= 3.4.0, < 3.4.13
Create a notification for this product.
Show details on NVD website

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CVE-2026-55209 (GCVE-0-2026-55209)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:52 – Updated: 2026-09-14 20:11
VLAI
Title
resdata insufficiently validates untrusted GRDECL files
Summary
resdata is software for reading and writing result files from the Eclipse reservoir simulator. Prior to 6.2.9, resdata insufficiently validates numeric fields, grid dimensions, keyword sizes, and array indexes while parsing untrusted GRDECL files in lib/resdata/rd_kw_grdecl.cpp and lib/resdata/rd_grid.cpp. Malformed COORD, ZCORN, CORSNUM, ACTNUM, or MAPAXES data can reach rd_grid_alloc_GRDECL_kw__ with inconsistent lengths, while unbounded floating-point conversion can exceed the intended parser buffer. In a network service that accepts untrusted GRDECL files, these conditions can cause a classic buffer overflow, out-of-bounds reads, invalid array access, NULL pointer dereference, memory corruption, or service termination. This issue is fixed in version 6.2.9.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 20:10 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-125 - Out-of-bounds Read
  • CWE-129 - Improper Validation of Array Index
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
equinor resdata Affected: < 6.2.9
Create a notification for this product.
Show details on NVD website

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CVE-2026-55204 (GCVE-0-2026-55204)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:05 – Updated: 2026-07-14 21:33 X_Open Source
VLAI
Title
HAProxy - NULL Pointer Dereference in hpack_dht_insert Function
Summary
HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 17:26 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Impacted products
Vendor Product Version
haproxy haproxy Affected: 0 , ≤ 3.4.0 (semver)
Unaffected: 9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513 (git)
    cpe:2.3:a:haproxy:aloha:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-06-16 00:00
Show details on NVD website

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CVE-2026-54084 (GCVE-0-2026-54084)

Vulnerability from cvelistv5 – Published: 2026-08-27 23:12 – Updated: 2026-08-28 15:27
VLAI
Title
Wazuh agent enrollment NULL pointer dereference via malformed manager response
Summary
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. In versions 4.0.0 through 4.14.6, a malicious or man-in-the-middle enrollment manager can crash a Wazuh agent during enrollment by returning a malformed key response with fewer than four fields, causing a NULL pointer dereference. The  w_enrollment_process_agent_key()  routine splits the manager-provided key into four space-separated fields but does not verify that all fields are present before passing them to validators. Because OS_StrBreak() leaves missing trailing entries as NULL and OS_IsValidName() calls strlen() on its argument without a NULL check, a response such as  OSSEC K:'1'  reaches OS_IsValidName(NULL) and terminates the agent process. Since Wazuh permits enrollment against an unverified manager when no CA certificate is configured, an attacker operating a rogue manager or intercepting the enrollment flow can deterministically crash agents, resulting in denial of service. This issue is fixed in version 4.14.7.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 15:27 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
References
Impacted products
Vendor Product Version
wazuh wazuh Affected: >= 4.0.0, < 4.14.7
Create a notification for this product.
Show details on NVD website

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Mitigation MIT-56
Implementation

For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].

Mitigation
Requirements

Select a programming language that is not susceptible to these issues.

Mitigation
Implementation

Check the results of all functions that return a value and verify that the value is non-null before acting upon it.

Mitigation
Architecture and Design

Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.

Mitigation
Implementation

Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.

No CAPEC attack patterns related to this CWE.