CVE-2026-42305Network attack vector

Code execution via Windows pathname reinterpretation

Published Jun 10, 2026 · Updated Jun 10, 2026

Path traversal in Dulwich 0.10.0 through 1.2.4 allows remote attackers to execute code through malicious repository checkout on Windows. The validate_path_element_ntfs check accepts backslashes, colons, and NTFS .git short-name aliases, letting checkout write into .git or beyond the work tree. Exploitation requires cloning, fetching, or checking out an untrusted repository on Windows; a planted hook runs in the user's context on a later commit, while POSIX checkout is not directly exploitable.

CVSS severity8.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Dulwich 0.10.0 through 1.2.4 allows remote attackers to execute code through malicious repository checkout on Windows. The validate_path_element_ntfs check accepts backslashes, colons, and NTFS .git short-name aliases, letting checkout write into .git or beyond the work tree. Exploitation requires cloning, fetching, or checking out an untrusted repository on Windows; a planted hook runs in the user's context on a later commit, while POSIX checkout is not directly exploitable.

The record

CVE
CVE-2026-42305
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Jelmer Vernooij
Product
Dulwich
Classifications
CWE-22, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.10.0, < 1.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jelmer Vernooij · Dulwichversion=>= 0.10.0, < 1.2.5

Published CVSS scores

6.9Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
8.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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