Common Weakness Enumeration
CWE-122
AllowedHeap-based Buffer Overflow
Abstraction: Variant · Status: Draft
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
5398 vulnerabilities reference this CWE, most recent first.
CVE-2026-90439 (GCVE-0-2026-90439)
Vulnerability from cvelistv5 – Published: 2026-09-15 14:27 – Updated: 2026-09-16 15:09
VLAI
EPSS
VEX
Title
NGINX ngx_http_v3_module vulnerability
Summary
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption.
Impact:
This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 14:48 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://my.f5.com/manage/s/article/K000162604 | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| F5 | NGINX Plus |
Affected:
37.1.0.1 , < 37.1.1.2
(custom)
Affected: 37.0.0.1 , < 37.0.6.2 (custom) |
|
| F5 | NGINX Open Source |
Affected:
1.29.2 , < 1.31.6
(semver)
Affected: 1.30.4 , < 1.30.5 (semver) |
Date Public
2026-09-15 14:00
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CVE-2026-89028 (GCVE-0-2026-89028)
Vulnerability from cvelistv5 – Published: 2026-09-16 13:12 – Updated: 2026-10-01 15:21
VLAI
EPSS
VEX
Title
MikroTik RouterOS < 7.24 Heap Corruption via SMB1 SessionSetupAndX
Summary
MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 19:16 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://forum.mikrotik.com/t/7-24-stable-is-relea… | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/mikrotik-rou… | third-party-advisory |
Impacted products
Date Public
2026-08-17 00:00
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CVE-2026-88807 (GCVE-0-2026-88807)
Vulnerability from cvelistv5 – Published: 2026-09-21 13:49 – Updated: 2026-09-22 03:55
VLAI
EPSS
VEX
Title
libXrender RenderQueryPictFormats Reply Heap-based Buffer Overflow
Summary
A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://gitlab.freedesktop.org/xorg/lib/libxrende… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| X.org | libXrender |
Affected:
0 , < 0.9.13
(rpmver)
cpe:2.3:a:x.org:libxrender:*:*:*:*:*:*:*:* |
Date Public
2026-09-18 13:42
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CVE-2026-88806 (GCVE-0-2026-88806)
Vulnerability from cvelistv5 – Published: 2026-09-21 13:42 – Updated: 2026-09-22 03:55
VLAI
EPSS
VEX
Title
libX11 XkbGetMap Reply Heap-based Buffer Overflow
Summary
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://gitlab.freedesktop.org/xorg/lib/libx11/-/… | patch |
Impacted products
Date Public
2026-09-18 13:33
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CVE-2026-86716 (GCVE-0-2026-86716)
Vulnerability from cvelistv5 – Published: 2026-09-08 18:45 – Updated: 2026-09-08 19:08
VLAI
EPSS
VEX
Title
Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow
Summary
A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skip_spaces_and_comments of the file src/mjs_tok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 19:07 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/399773 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/399773/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-86716 | third-party-advisory |
| https://vuldb.com/submit/910881 | third-party-advisory |
| https://vuldb.com/submit/910882 | third-party-advisory |
| https://github.com/cesanta/mjs/issues/324 | exploitissue-tracking |
| https://github.com/cesanta/mjs/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cesanta | mJS |
Affected:
1.0
Affected: 1.1 Affected: 1.2 Affected: 1.3 Affected: 1.4 Affected: 1.5 Affected: 1.6 Affected: 1.7 Affected: 1.8 Affected: 1.9 Affected: 1.10 Affected: 1.11 Affected: 1.12 Affected: 1.13 Affected: 1.14 Affected: 1.15 Affected: 1.16 Affected: 1.17 Affected: 1.18 Affected: 1.19 Affected: 1.20 Affected: 1.21 Affected: 1.22 Affected: 1.23 Affected: 1.24 Affected: 1.25 Affected: 1.26 cpe:2.3:a:cesanta:mjs:*:*:*:*:*:*:*:* |
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CVE-2026-86142 (GCVE-0-2026-86142)
Vulnerability from cvelistv5 – Published: 2026-09-05 04:29 – Updated: 2026-09-14 13:50
VLAI
EPSS
VEX
Summary
In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.
Severity
6.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:26 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
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CVE-2026-85880 (GCVE-0-2026-85880)
Vulnerability from cvelistv5 – Published: 2026-09-08 17:14 – Updated: 2026-10-01 22:56
VLAI
EPSS
VEX
Title
Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
Summary
Heap-based buffer overflow in Windows ALPC 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 2026-09-08 00:00 UTC
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
13 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows 10 Version 21H2 |
Affected:
10.0.19044.0 , < 10.0.19044.7725
(custom)
|
|
| Microsoft | Windows 10 Version 22H2 |
Affected:
10.0.19045.0 , < 10.0.19045.7725
(custom)
|
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.9200.0 , < 6.2.9200.26349
(custom)
|
|
| Microsoft | Windows Server 2012 (Server Core installation) |
Affected:
6.2.9200.0 , < 6.2.9200.26349
(custom)
|
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.9600.0 , < 6.3.9600.23398
(custom)
|
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
Affected:
6.3.9600.0 , < 6.3.9600.23398
(custom)
|
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.9512
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.9245
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.5622
(custom)
|
Date Public
2026-09-08 14:00
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CVE-2026-85877 (GCVE-0-2026-85877)
Vulnerability from cvelistv5 – Published: 2026-09-08 17:14 – Updated: 2026-10-01 22:56
VLAI
EPSS
VEX
Title
Windows Print Spooler Remote Code Execution Vulnerability
Summary
Heap-based buffer overflow in Windows Print Spooler Components allows an unauthorized attacker to execute code over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 18:57 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 11 Version 24H2 |
Affected:
10.0.26100.0 , < 10.0.26100.9445
(custom)
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:x64:* |
Date Public
2026-09-08 14:00
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CVE-2026-85103 (GCVE-0-2026-85103)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:00 – Updated: 2026-09-10 03:56
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in VPN Certificate ASN.1 Decoding
Summary
A heap-based buffer overflow in VPN certificate ASN.1 decoding may allow an unauthenticated remote attacker to execute arbitrary code on Check Point Quantum Security Management and Quantum Security Gateway systems.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow.
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| checkpoint | Quantum Security Gateway |
Affected:
R82.10 with Jumbo Hotfix Take 43 or below
Affected: R82 with Jumbo Hotfix Take 125 or below Affected: R81.20 with Jumbo Hotfix Take 165 or below |
|
| checkpoint | Quantum Security Management |
Affected:
R82.10 with Jumbo Hotfix Take 43 or below
Affected: R82 with Jumbo Hotfix Take 125 or below Affected: R81.20 with Jumbo Hotfix Take 165 or below |
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CVE-2026-84269 (GCVE-0-2026-84269)
Vulnerability from cvelistv5 – Published: 2026-09-01 15:19 – Updated: 2026-09-04 02:04
VLAI
EPSS
VEX
Title
Gvfs: afp: heap-based buffer overflow in dsi read path
Summary
A flaw was found in the AFP backend in gvfs. When mounting a share, a malicious AFP server can cause the DSI read path to process a length that exceeds the size requested by the client. The function does not verify the server-provided length against the pre-sized reply buffer, causing the operation to access past the intended boundaries. This issue allows a malicious server to overflow a heap buffer and crash the gvfsd-afp process, resulting in a denial of service.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 02:04 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-84269 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2526784 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/gvfs/-/issues/863 |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| GNOME | gvfs |
Affected:
0 , < 1.60.2
(semver)
|
|
| 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
2026-08-03 00:00
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Mitigation
Pre-design: Use a language or compiler that performs automatic bounds checking.
Mitigation
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Mitigation MIT-10
Operation
Build and Compilation
Strategy: Environment Hardening
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
- D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
Mitigation MIT-11
Operation
Build and Compilation
Strategy: Environment Hardening
- Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
- Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
- For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
Mitigation
Implementation
Implement and perform bounds checking on input.
Mitigation
Implementation
Strategy: Libraries or Frameworks
Do not use dangerous functions such as gets. Look for their safe equivalent, which checks for the boundary.
Mitigation
Operation
Use OS-level preventative functionality. This is not a complete solution, but it provides some defense in depth.
CAPEC-92: Forced Integer Overflow
This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.