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-2026-44636 (GCVE-0-2026-44636)
Vulnerability from cvelistv5 – Published: 2026-05-14 20:01 – Updated: 2026-05-16 03:56
VLAI
Title
libsixel: integer overflow in encoder
Summary
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor's allocation size calculation can lead to a heap buffer overflow. The public sixel_encode entry point validates only that width and height are greater than zero, with no upper bound. width and height are multiplied as plain int when computing the allocation size for paletted_pixels and normalized_pixels. Any caller that asks libsixel to encode a pixel buffer with width times height greater than INT_MAX (about 2.15 billion) will hit a wrapped allocation size; under the right wrap, the malloc succeeds with a buffer much smaller than the encoder expects, and the encoder writes past the end of the heap allocation. This vulnerability is fixed in 1.8.7-r2.
Severity
7.4 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/saitoha/libsixel/security/advi… | x_refsource_CONFIRM |
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CVE-2026-44662 (GCVE-0-2026-44662)
Vulnerability from cvelistv5 – Published: 2026-05-14 20:18 – Updated: 2026-05-16 01:01
VLAI
Title
rust-openssl: Heap buffer overflow when encrypting with AES key-wrap-with-padding
Summary
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.0 to before 0.10.79, CipherCtxRef::cipher_update, CipherCtxRef::cipher_update_vec, and symm::Crypter::update incorrectly sized output buffers when used with AES key-wrap-with-padding ciphers (EVP_aes_{128,192,256}_wrap_pad). For a non-multiple-of-8 input, OpenSSL writes up to 7 bytes past the end of the caller's buffer or Vec, producing attacker-controllable heap corruption when the plaintext length is attacker-influenced. This only impacts users using AES key-wrap-with-padding ciphers. This vulnerability is fixed in 0.10.79.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/rust-openssl/rust-openssl/secu… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rust-openssl | rust-openssl |
Affected:
>= 0.10.0, < 0.10.79
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CVE-2026-44983 (GCVE-0-2026-44983)
Vulnerability from cvelistv5 – Published: 2026-05-26 21:38 – Updated: 2026-05-27 12:45
VLAI
Title
smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow
Summary
smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1.
Severity
7.3 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/servo/smallbitvec/security/adv… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| servo | smallbitvec |
Affected:
>= 1.0.1, < 2.6.1
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CVE-2026-45130 (GCVE-0-2026-45130)
Vulnerability from cvelistv5 – Published: 2026-05-08 22:42 – Updated: 2026-05-14 05:17
VLAI
Title
Vim: Heap Buffer Overflow in spell file loading
Summary
Vim is an open source, command line text editor. Prior to version 9.2.0450, a heap buffer overflow exists in read_compound() in src/spellfile.c when loading a crafted spell file (.spl) with UTF-8 encoding active. An attacker-controlled length field in the spell file's compound section overflows a 32-bit signed integer multiplication, causing a small buffer to be allocated for a write loop that runs many iterations, overflowing the heap. Because the 'spelllang' option can be set from a modeline, a text file modeline can trigger spell file loading if a malicious .spl file has been planted on the runtimepath. This issue has been patched in version 9.2.0450.
Severity
6.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/vim/vim/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/vim/vim/commit/92993329178cb1f… | x_refsource_MISC |
| https://github.com/vim/vim/releases/tag/v9.2.0450 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2026/05/14/3 |
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CVE-2026-45252 (GCVE-0-2026-45252)
Vulnerability from cvelistv5 – Published: 2026-05-21 09:08 – Updated: 2026-05-21 13:47
VLAI
Title
Heap overflow in FUSE_LISTXATTR
Summary
When a fusefs file system implements extended attributes, the kernel may send a FUSE_LISTXATTR message to the userspace daemon to retrieve the list of extended attributes for a given file. The FUSE protocol requires the daemon to return a packed list of NUL-terminated strings. The fusefs kernel module calls strlen() on this daemon-supplied buffer without first verifying that the entire list is NUL-terminated.
If a malicious daemon sends a non-NUL-terminated list, the fusefs kernel module may read beyond the end of one heap-allocated buffer and potentially write beyond the end of a second buffer. A malicious daemon could disclose up to 253 bytes of kernel heap memory, or it could inject up to 250 attacker-controlled bytes into unallocated kernel heap space.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-S… | vendor-advisory |
Impacted products
Date Public
2026-05-20 23:00
Credits
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CVE-2026-45584 (GCVE-0-2026-45584)
Vulnerability from cvelistv5 – Published: 2026-05-20 13:09 – Updated: 2026-06-05 16:39
VLAI
Title
Microsoft Defender Remote Code Execution Vulnerability
Summary
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
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 | Microsoft Malware Protection Engine |
Affected:
1.1.0.0 , < 1.1.26040.8
(custom)
|
Date Public
2026-05-19 14:00
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CVE-2026-47311 (GCVE-0-2026-47311)
Vulnerability from cvelistv5 – Published: 2026-05-19 04:58 – Updated: 2026-05-19 12:29
VLAI
Summary
Heap-based buffer overflow vulnerability in Samsung Open Source Escargot allows Overflow Buffers.
This issue affects Escargot: 590345cc6258317c5da850d846ce6baaf2afc2d3.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based buffer overflow
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Samsung Open Source | Escargot |
Affected:
590345cc6258317c5da850d846ce6baaf2afc2d3
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CVE-2026-48065 (GCVE-0-2026-48065)
Vulnerability from cvelistv5 – Published: 2026-05-27 19:58 – Updated: 2026-05-28 13:44
VLAI
Title
pam_usb: Unchecked integer multiplication before xmalloc() in conf.c allows heap-based buffer overflow on 32-bit targets
Summary
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Severity
6.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mcdope/pam_usb/security/adviso… | x_refsource_CONFIRM |
| https://github.com/mcdope/pam_usb/issues/352 | x_refsource_MISC |
| https://github.com/mcdope/pam_usb/issues/55 | x_refsource_MISC |
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CVE-2026-48131 (GCVE-0-2026-48131)
Vulnerability from cvelistv5 – Published: 2026-05-26 12:56 – Updated: 2026-05-26 15:18
VLAI
Title
VPND IKE Fragment Reassembly - Heap Out-of-Bounds Write via Sequence Number Zero
Summary
The VPN service may mishandle an unexpected IKE fragment value received on the IKE port 500/UDP during the early stage of a connection attempt. This can cause the service to terminate unexpectedly, resulting in denial of service (temporary disruption of VPN-related functionality).
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| checkpoint | Quantum Security Gateway |
Affected:
R82.10 with Jumbo Hotfix Take 6 or below
Affected: R82 with Jumbo Hotfix Take 91 or below Affected: R81.20 with Jumbo Hotfix Take 127 or below Affected: All releases from R81.10 and below |
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CVE-2026-48135 (GCVE-0-2026-48135)
Vulnerability from cvelistv5 – Published: 2026-05-26 12:57 – Updated: 2026-05-27 18:36
VLAI
Title
HTTP service can incorrectly process malformed HTTP requests
Summary
A Check Point HTTP-based service can incorrectly handle malformed HTTP requests.
The issue is related to HTTP request parsing and validation.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| checkpoint | Quantum Security Gateway |
Affected:
R82.10 with Jumbo Hotfix Take 6 or below
Affected: R82 with Jumbo Hotfix Take 91 or below Affected: R81.20 with Jumbo Hotfix Take 127 or below Affected: All releases from R81.10 and below |
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Quantum Security Gateway",
"vendor": "checkpoint",
"versions": [
{
"status": "affected",
"version": "R82.10 with Jumbo Hotfix Take 6 or below"
},
{
"status": "affected",
"version": "R82 with Jumbo Hotfix Take 91 or below"
},
{
"status": "affected",
"version": "R81.20 with Jumbo Hotfix Take 127 or below"
},
{
"status": "affected",
"version": "All releases from R81.10 and below"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A Check Point HTTP-based service can incorrectly handle malformed HTTP requests.\nThe issue is related to HTTP request parsing and validation."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-122",
"description": "CWE-122: Heap-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-26T14:16:28.067Z",
"orgId": "897c38be-0345-43cd-b6cf-fe179e0c4f45",
"shortName": "checkpoint"
},
"references": [
{
"url": "https://support.checkpoint.com/results/sk/sk184991"
}
],
"title": "HTTP service can incorrectly process malformed HTTP requests"
}
},
"cveMetadata": {
"assignerOrgId": "897c38be-0345-43cd-b6cf-fe179e0c4f45",
"assignerShortName": "checkpoint",
"cveId": "CVE-2026-48135",
"datePublished": "2026-05-26T12:57:19.074Z",
"dateReserved": "2026-05-20T19:29:00.635Z",
"dateUpdated": "2026-05-27T18:36:10.600Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.