Vulnerability · Published Oct 21, 2026 · Assigned by VulnCheck

CVE-2026-114095Dulwich before 1.2.9 Infinite Loop DoS via Pack.resolve_object

Medium 6.5

In plain English

A medium-severity infinite loop in dulwich from jelmer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 76.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Dulwich before 1.2.9 contains a denial of service vulnerability in Pack.resolve_object that allows attackers to cause infinite recursion via self-referential OFS_DELTA objects. Attackers can supply a malicious packfile with an OFS_DELTA delta_offset of 0 to exhaust CPU during clone, fetch, or cat-file operations.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	dulwich	no fix listed	DEBIAN-CVE-2026-114095
Debian:13	dulwich	no fix listed	DEBIAN-CVE-2026-114095
Debian:14	dulwich	1.2.11-1	DEBIAN-CVE-2026-114095
PyPI	dulwich	1.2.9	GHSA-35mr-4567-66vg
Ubuntu:22.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114095
Ubuntu:24.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114095
Ubuntu:26.04:LTS	dulwich	no fix listed	UBUNTU-CVE-2026-114095

Affected products (as reported)

Vendor	Product	Versions
jelmer	dulwich	0 – before 1.2.9

Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-35mr-4567-66vg) vendor-advisory
VulnCheck Advisory: Dulwich before 1.2.9 Infinite Loop DoS via Pack.resolve_object third-party-advisory