DSA-6453-1 libgit2 - security update

lowpublic exploitCVE-2026-5917 CVE-2026-53583 CVE-2026-53584 CVE-2026-53585 CVE-2026-53586 CVE-2026-53587

Multiple security issues were discovered in libgit2, a low-level Git library, which could result in the execution of arbitrary commands on a remote SSH server, disclosure of credentials, denial of service or the creation of directories outside a repository's working tree. https://security-tracker.debian.org/tracker/DSA-6453-1

CSIRTS triage

vendor: libgit2 product: libgit2 Remote code execution Information disclosure Denial of service Path traversal

What: Multiple vulnerabilities allow arbitrary command execution on remote SSH servers, credential disclosure, denial of service, and directory creation outside the repository working tree.
Who is affected: All deployments of libgit2 using the affected functionality are at risk.
Urgency: Urgent; remote code execution on SSH servers is a critical security risk with active exploitation potential.
Action: Apply the security update DSA-6453-1 immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Debian Security Advisories (INTL · vendor-psirt · site)
Severity: low
Published: 2026-08-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00364.html

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-59170.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-535830.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-535840.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-535850.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-535860.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-535870.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-5917	coverage & exploitation status	NVD · CVE.org
CVE-2026-53583	coverage & exploitation status	NVD · CVE.org
CVE-2026-53584	coverage & exploitation status	NVD · CVE.org
CVE-2026-53585	coverage & exploitation status	NVD · CVE.org
CVE-2026-53586	coverage & exploitation status	NVD · CVE.org
CVE-2026-53587	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.