Libgit2: [Unknown description] (CVE-2026-53586)
A vulnerability in libgit2 was discovered involving incorrect handling of certain capability buffers in the Git Smart Protocol. This flaw could allow a remote attacker to cause a denial of service. The issue affects specific Ubuntu LTS releases, particularly 24.04 LTS and 26.04 LTS. A fix is available through standard system updates or Ubuntu Pro Extended Security Maintenance (ESM) for affected versions.
AI Analysis
Technical Summary
CVE-2026-53586 is a medium severity vulnerability in libgit2 where improper handling of certain capability buffers in the Git Smart Protocol can lead to a denial of service condition. The vulnerability affects multiple Ubuntu LTS releases, notably 24.04 LTS and 26.04 LTS. The vendor advisory indicates that this issue is addressed by updating to fixed package versions provided via Ubuntu standard updates or Ubuntu Pro ESM. No known exploits are reported in the wild.
Potential Impact
A remote attacker could exploit this vulnerability to cause a denial of service on systems running affected versions of libgit2. There is no indication of code execution or data confidentiality impact. The vulnerability requires no privileges and no user interaction, but the attack vector is network-based.
Mitigation Recommendations
A patch is available and should be applied by updating libgit2 to the fixed versions provided by Ubuntu for the affected LTS releases. For Ubuntu 24.04 LTS and 26.04 LTS, standard system updates include the fix. For Ubuntu 20.04 LTS, 22.04 LTS, and 18.04 LTS, fixes are available via Ubuntu Pro Extended Security Maintenance (ESM). Users should apply these updates promptly to mitigate the vulnerability.
Libgit2: [Unknown description] (CVE-2026-53586)
Description
A vulnerability in libgit2 was discovered involving incorrect handling of certain capability buffers in the Git Smart Protocol. This flaw could allow a remote attacker to cause a denial of service. The issue affects specific Ubuntu LTS releases, particularly 24.04 LTS and 26.04 LTS. A fix is available through standard system updates or Ubuntu Pro Extended Security Maintenance (ESM) for affected versions.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/libgit2?arch=source&distro=focalpkg:deb/ubuntu/libgit2?arch=source&distro=jammypkg:deb/ubuntu/libgit2?arch=source&distro=noblepkg:deb/ubuntu/libgit2?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53586 is a medium severity vulnerability in libgit2 where improper handling of certain capability buffers in the Git Smart Protocol can lead to a denial of service condition. The vulnerability affects multiple Ubuntu LTS releases, notably 24.04 LTS and 26.04 LTS. The vendor advisory indicates that this issue is addressed by updating to fixed package versions provided via Ubuntu standard updates or Ubuntu Pro ESM. No known exploits are reported in the wild.
Potential Impact
A remote attacker could exploit this vulnerability to cause a denial of service on systems running affected versions of libgit2. There is no indication of code execution or data confidentiality impact. The vulnerability requires no privileges and no user interaction, but the attack vector is network-based.
Mitigation Recommendations
A patch is available and should be applied by updating libgit2 to the fixed versions provided by Ubuntu for the affected LTS releases. For Ubuntu 24.04 LTS and 26.04 LTS, standard system updates include the fix. For Ubuntu 20.04 LTS, 22.04 LTS, and 18.04 LTS, fixes are available via Ubuntu Pro Extended Security Maintenance (ESM). Users should apply these updates promptly to mitigate the vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53586
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
Threat ID: 6a7cd43ebf8831d5391869a0
Added to database: 08/12/2026, 20:14:54 UTC
Last enriched: 08/24/2026, 15:56:32 UTC
Last updated: 09/26/2026, 01:47:42 UTC
Views: 40
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