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().
4595 vulnerabilities reference this CWE, most recent first.
CVE-2026-56159 (GCVE-0-2026-56159)
Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-09-04 22:16
VLAI
EPSS
VEX
Title
DHCP Server Service Remote Code Execution Vulnerability
Summary
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-11 00:00 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
13 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 |
Affected:
10.0.14393.0 , < 10.0.14393.9339
(custom)
|
|
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.17763.0 , < 10.0.17763.9020
(custom)
|
|
| Microsoft | Windows Server 2012 |
Affected:
6.2.9200.0 , < 6.2.9200.26226
(custom)
|
|
| Microsoft | Windows Server 2012 (Server Core installation) |
Affected:
6.2.9200.0 , < 6.2.9200.26226
(custom)
|
|
| Microsoft | Windows Server 2012 R2 |
Affected:
6.3.9600.0 , < 6.3.9600.23291
(custom)
|
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) |
Affected:
6.3.9600.0 , < 6.3.9600.23291
(custom)
|
|
| Microsoft | Windows Server 2016 |
Affected:
10.0.14393.0 , < 10.0.14393.9339
(custom)
|
|
| Microsoft | Windows Server 2016 (Server Core installation) |
Affected:
10.0.14393.0 , < 10.0.14393.9339
(custom)
|
|
| Microsoft | Windows Server 2019 |
Affected:
10.0.17763.0 , < 10.0.17763.9020
(custom)
|
|
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.17763.0 , < 10.0.17763.9020
(custom)
|
|
| Microsoft | Windows Server 2022 |
Affected:
10.0.20348.0 , < 10.0.20348.5386
(custom)
|
|
| Microsoft | Windows Server 2025 |
Affected:
10.0.26100.0 , < 10.0.26100.33158
(custom)
|
|
| Microsoft | Windows Server 2025 (Server Core installation) |
Affected:
10.0.26100.0 , < 10.0.26100.33158
(custom)
|
Date Public
2026-07-14 14:00
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CVE-2026-56156 (GCVE-0-2026-56156)
Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-09-04 22:16
VLAI
EPSS
VEX
Title
Microsoft Excel Remote Code Execution Vulnerability
Summary
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 00:00 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
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office 365 for Mac |
Affected:
1.0.0 , < 16.111.26071215
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2021 |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2024 |
Affected:
16.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC for Mac 2021 |
Affected:
16.0.1 , < 16.111.26071215
(custom)
|
|
| Microsoft | Microsoft Office LTSC for Mac 2024 |
Affected:
16.0.0 , < 16.111.26071215
(custom)
|
Date Public
2026-07-14 14:00
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CVE-2026-56123 (GCVE-0-2026-56123)
Vulnerability from cvelistv5 – Published: 2026-06-25 15:43 – Updated: 2026-07-14 21:34 X_Open Source
VLAI
EPSS
VEX
Title
socat 1.8.0.0 - 1.8.1.1 Heap Buffer Overflow via SOCKS5 Reply Parser
Summary
socat versions 1.8.0.0 through 1.8.1.1 contain a heap-based buffer overflow vulnerability that allows a malicious SOCKS5 proxy server to overwrite adjacent heap memory by exploiting a sign-extension flaw in the DOMAINNAME reply parser. During connection setup, the domain name length byte is read through a signed char field causing a negative bytes_to_read value that is implicitly converted to size_t, resulting in an unbounded heap write into the 262-byte reply buffer with attacker-controlled size and content.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 02:03 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| http://www.dest-unreach.org/socat/CHANGES | release-notespatch |
| https://www.vulncheck.com/advisories/socat-heap-b… | third-party-advisory |
Impacted products
Date Public
2026-06-25 00:00
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CVE-2026-56003 (GCVE-0-2026-56003)
Vulnerability from cvelistv5 – Published: 2026-07-08 09:25 – Updated: 2026-07-09 03:55
VLAI
EPSS
VEX
Title
libXfont2 computeProps Property Buffer Heap Buffer Overflow
Summary
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Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2026/… | vendor-advisory |
| https://gitlab.freedesktop.org/xorg/lib/libxfont/… | patch |
Impacted products
Date Public
2026-07-08 09:22
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CVE-2026-56002 (GCVE-0-2026-56002)
Vulnerability from cvelistv5 – Published: 2026-07-08 09:12 – Updated: 2026-07-09 03:55
VLAI
EPSS
VEX
Title
libXfont2 PCF Font Parsing Heap Buffer Overflow
Summary
A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gitlab.freedesktop.org/xorg/lib/libxfont/… | patch |
| https://www.openwall.com/lists/oss-security/2026/… | vendor-advisory |
Impacted products
Date Public
2026-07-08 09:08
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CVE-2026-56001 (GCVE-0-2026-56001)
Vulnerability from cvelistv5 – Published: 2026-07-08 08:49 – Updated: 2026-07-09 03:55
VLAI
EPSS
VEX
Title
libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow
Summary
A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2026/… | vendor-advisory |
| https://gitlab.freedesktop.org/xorg/lib/libxfont/… | patch |
Date Public
2026-07-08 08:15
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CVE-2026-55999 (GCVE-0-2026-55999)
Vulnerability from cvelistv5 – Published: 2026-07-08 08:07 – Updated: 2026-07-09 03:55
VLAI
EPSS
VEX
Title
xorg-server / xwayland glamor font atlas Heap Buffer Overflow
Summary
Local attackers with a X connection able to provide PCX fonts to the X
server xorg-server before 21.2.24 and xwayland before 24.1.13 could
cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 00:00 UTC
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gitlab.freedesktop.org/xorg/xserver/-/com… | patch |
| https://www.openwall.com/lists/oss-security/2026/… | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| X.Org | xorg-server |
Affected:
0 , < 21.1.24
(rpm)
|
|
| X.Org | xwayland |
Affected:
0 , < 24.1.13
(rpm)
|
Date Public
2026-07-08 07:51
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CVE-2026-55971 (GCVE-0-2026-55971)
Vulnerability from cvelistv5 – Published: 2026-07-27 11:11 – Updated: 2026-07-28 03:55
VLAI
EPSS
VEX
Title
Apache Thrift: C++ ZLIB heap buffer overflow (write) in THeaderTransport::untransform()
Summary
Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings.
This issue affects Apache Thrift: before 0.24.0.
Users are recommended to upgrade to version 0.24.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 00:00 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/7v3jhgwfbmhx42424… | vendor-advisory |
| https://lists.apache.org/thread/xjs36m6kjxpmrmzwc… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.24.0
(semver)
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CVE-2026-55947 (GCVE-0-2026-55947)
Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-09-04 22:16
VLAI
EPSS
VEX
Title
Microsoft Excel Remote Code Execution Vulnerability
Summary
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 03:56 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
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Excel 2016 |
Affected:
16.0.0.0 , < 16.0.5561.1001
(custom)
|
|
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office 365 for Mac |
Affected:
1.0.0 , < 16.111.26071215
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2021 |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2024 |
Affected:
16.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC for Mac 2021 |
Affected:
16.0.1 , < 16.111.26071215
(custom)
|
|
| Microsoft | Microsoft Office LTSC for Mac 2024 |
Affected:
16.0.0 , < 16.111.26071215
(custom)
|
|
| Microsoft | Office Online Server |
Affected:
16.0.0.0 , < 16.0.10417.20175
(custom)
|
Date Public
2026-07-14 14:00
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CVE-2026-55893 (GCVE-0-2026-55893)
Vulnerability from cvelistv5 – Published: 2026-08-20 21:32 – Updated: 2026-08-21 21:45
VLAI
EPSS
VEX
Title
Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode
Summary
Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c SH floating-point decoders such as opFADD, opFMUL, and opFSUB call set_reg() and set_reg_n() using sh_info.op.op_count without checking the fixed-size operands[] array. Repeated crafted instructions processed through cs_disasm_iter() or cs_disasm() with CS_ARCH_SH, CS_MODE_SH2A or CS_MODE_SH4A, CS_MODE_SHFPU, and CS_OPT_DETAIL can increment the operand count beyond the 176-byte sh_info allocation and perform a four-byte heap buffer overflow write. The corruption can crash the process and may enable code execution depending on heap layout. This issue is fixed in version 6.0.0-Alpha10.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:00 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/capstone-engine/capstone/secur… | x_refsource_CONFIRM |
| https://github.com/capstone-engine/capstone/pull/2968 | x_refsource_MISC |
| https://github.com/capstone-engine/capstone/pull/2969 | x_refsource_MISC |
| https://github.com/capstone-engine/capstone/commi… | x_refsource_MISC |
| https://github.com/capstone-engine/capstone/commi… | x_refsource_MISC |
| https://github.com/capstone-engine/capstone/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| capstone-engine | capstone |
Affected:
< 6.0.0-Alpha10
|
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"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-122",
"description": "CWE-122: Heap-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-20T21:32:46.718Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"
},
{
"name": "https://github.com/capstone-engine/capstone/pull/2968",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/capstone-engine/capstone/pull/2968"
},
{
"name": "https://github.com/capstone-engine/capstone/pull/2969",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/capstone-engine/capstone/pull/2969"
},
{
"name": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e"
},
{
"name": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed"
},
{
"name": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10"
}
],
"source": {
"advisory": "GHSA-3hpv-wr3j-rxwh",
"discovery": "UNKNOWN"
},
"title": "Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55893",
"datePublished": "2026-08-20T21:32:46.718Z",
"dateReserved": "2026-06-17T16:59:42.760Z",
"dateUpdated": "2026-08-21T21:45:29.340Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.