CVE-2026-53587

Published: Ago 20, 2026 Last Modified: Ago 20, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. This issue is fixed in versions 1.8.6 and 1.9.5.

20

Improper Input Validation

Stable
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Confidentiality Integrity
Potential Impacts:
Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Read Memory Read Files Or Directories Modify Memory Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies: AI/ML
Likelihood of Exploit: High
View CWE Details
125

Out-of-bounds Read

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Other
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Varies By Context
Applicable Platforms
Languages: Memory-Unsafe, C, C++
Technologies: ICS/OT
View CWE Details
126

Buffer Over-read

Draft
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Integrity
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart
Applicable Platforms
Languages: Memory-Unsafe, C, C++
View CWE Details
1284

Improper Validation of Specified Quantity in Input

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Other Integrity Availability
Potential Impacts:
Varies By Context Dos: Resource Consumption (Cpu) Modify Memory Read Memory
Applicable Platforms
All platforms may be affected
View CWE Details
https://github.com/libgit2/libgit2/security/advisories/GHSA…
https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm
https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab…
https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab0db28239462a671e2e54…
https://github.com/libgit2/libgit2/commit/affda60c10fcef167…
https://github.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20…
https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9…
https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7…
https://github.com/libgit2/libgit2/releases/tag/v1.8.6
https://github.com/libgit2/libgit2/releases/tag/v1.8.6
https://github.com/libgit2/libgit2/releases/tag/v1.9.5
https://github.com/libgit2/libgit2/releases/tag/v1.9.5
https://github.com/libgit2/libgit2/security/advisories/GHSA…
https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm