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CWE-122
Heap-based Buffer Overflow
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().
CVE-2026-54696 (GCVE-0-2026-54696)
Vulnerability from cvelistv5 – Published: 2026-06-30 22:05 – Updated: 2026-07-01 13:20
VLAI
EPSS
VEX
Title
Ruby JSON: JSON generator heap buffer overflow when streaming to an IO
Summary
Ruby JSON is a JSON implementation for Ruby. Versions 2.9.0 through 2.19.8 are vulnerable to heap buffer overflow when the JSON generator is provided with an oversized streamed object. When streaming to an IO JSON.dump(obj, io) and JSON::State#generate(obj, io) can write past the internal JSON generator buffer when a streamed object contains an
attacker-controlled string near 16 KB. Exploitation would result in a reliable process crash/denial of service. This issue has been fixed in version 2.19.9.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ruby/json/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/ruby/json/releases/tag/v2.19.9 | x_refsource_MISC |
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CVE-2026-5474 (GCVE-0-2026-5474)
Vulnerability from cvelistv5 – Published: 2026-04-03 17:00 – Updated: 2026-04-03 20:02
VLAI
EPSS
VEX
Title
NASA cFS CCSDS Packet Header to_lab_passthru_encode.c CFE_MSG_GetSize heap-based overflow
Summary
A vulnerability was found in NASA cFS up to 7.0.0. This affects the function CFE_MSG_GetSize of the file apps/to_lab/fsw/src/to_lab_passthru_encode.c of the component CCSDS Packet Header Handler. Performing a manipulation results in heap-based buffer overflow. The attacker must have access to the local network to execute the attack. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/355078 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/355078/cti | signaturepermissions-required |
| https://vuldb.com/submit/781950 | third-party-advisory |
| https://github.com/nasa/cFS/issues/952 | issue-tracking |
| https://github.com/nasa/cFS/ | product |
Impacted products
Credits
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CVE-2026-54896 (GCVE-0-2026-54896)
Vulnerability from cvelistv5 – Published: 2026-06-30 23:20 – Updated: 2026-07-01 12:39
VLAI
EPSS
VEX
Title
Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent
Summary
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. This issue has been fixed in version 3.17.2.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/ohler55/oj/security/advisories… | x_refsource_CONFIRM |
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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 (v2.0.3)
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-2026-56001 (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 (v2.0.3)
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-2026-56002 (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 (v2.0.3)
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 |
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2026-07-08 09:08
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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
A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
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 09:22
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CVE-2026-56123 (GCVE-0-2026-56123)
Vulnerability from cvelistv5 – Published: 2026-06-25 15:43 – Updated: 2026-06-26 02:03 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 (v2.0.3)
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-2026-56208 (GCVE-0-2026-56208)
Vulnerability from cvelistv5 – Published: 2026-06-19 16:28 – Updated: 2026-07-08 12:05
VLAI
EPSS
VEX
Title
Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode
Summary
A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.
Severity
7.6 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:30814 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-56208 | vdb-entryx_refsource_REDHAT |
| https://aomedia.googlesource.com/aom/+/243f8ae84b | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2490799 | issue-trackingx_refsource_REDHAT |
| https://issues.chromium.org/issues/504317456 | |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.14.0-0.1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat AI Inference Server |
cpe:/a:redhat:ai_inference_server:3 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
Date Public
2026-06-19 00:00
Credits
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CVE-2026-56372 (GCVE-0-2026-56372)
Vulnerability from cvelistv5 – Published: 2026-07-11 13:00 – Updated: 2026-07-11 13:00
VLAI
EPSS
VEX
Title
ImageMagick - Heap Buffer Overflow Read via Unrecognized Magnify Method
Summary
ImageMagick before 7.1.2-19 contains a heap buffer overflow vulnerability in the magnify operation that allows attackers to read out of bounds memory. An unrecognized magnify:method value triggers an out of bounds read, potentially exposing sensitive information or causing denial of service.
Severity
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ImageMagick/ImageMagick/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/imagemagick-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ImageMagick | ImageMagick |
Affected:
0 , < 7.1.2-19
(semver)
Unaffected: 7.1.2-19 (semver) |
Date Public
2026-04-13 00:00
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Mitigation
Phases:
Description:
- Pre-design: Use a language or compiler that performs automatic bounds checking.
Mitigation
Phase: Architecture and Design
Description:
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
Mitigation ID: MIT-10
Phases: Operation, Build and Compilation
Strategy: Environment Hardening
Description:
- 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 ID: MIT-11
Phases: Operation, Build and Compilation
Strategy: Environment Hardening
Description:
- 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
Phase: Implementation
Description:
- Implement and perform bounds checking on input.
Mitigation
Phase: Implementation
Strategy: Libraries or Frameworks
Description:
- Do not use dangerous functions such as gets. Look for their safe equivalent, which checks for the boundary.
Mitigation
Phase: Operation
Description:
- 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.