Denial of Service Vulnerability in Dulwich by GitHub
CVE-2026-114095

7.1HIGH

Key Information:

Vendor

Jelmer

Status
Dulwich
Vendor
CVE Published:
21 October 2026

What is CVE-2026-114095?

Dulwich versions prior to 1.2.9 are susceptible to a denial of service attack through a flaw in the Pack.resolve_object method. This vulnerability allows attackers to create a malicious packfile featuring an OFS_DELTA delta_offset set to 0, which can lead to infinite recursion. During operations such as clone, fetch, or cat-file, this exploitation results in excessive CPU consumption, potentially disrupting service availability for users.

Affected Version(s)

dulwich 0 < 1.2.9

dulwich 1.2.9

References

https://github.com/jelmer/dulwich/security/advisories/GHS...
vendor-advisory
https://www.vulncheck.com/advisories/dulwich-before-1.2.9...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

LukeBanto
.