---
id: "CVE-2026-114095"
kind: "vulnerability"
aliases: ["CVE-2026-114095"]
title: "Dulwich: crafted packfile causes infinite recursion and CPU exhaustion"
severity: "high"
cvss: 7.1
epss: 0.00254
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["dulwich", "git", "package", "python", "self-hosted"]
not_affected_if: ["trusted-repos-only"]
published_at: "2026-10-21T01:17:34+00:00"
first_seen_at: "2026-10-23T21:57:28+00:00"
updated_at: "2026-10-25T03:32:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114095", "first_seen_at": "2026-10-23T21:57:28+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-114095", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Dulwich: crafted packfile causes infinite recursion and CPU exhaustion

Dulwich, a pure-Python Git implementation, recurses forever when a packfile contains an OFS_DELTA object pointing at offset 0. An attacker who serves a malicious repository can exhaust CPU during clone, fetch or cat-file.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `pip show dulwich` and check whether the version is below `1.2.9`
- Search lock files for `dulwich` pinned below `1.2.9`

## Fix

- Upgrade the Python package `dulwich` to `1.2.9` or later

## Timeline

- 2026-10-23T21:57:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114095
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-114095

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_