CVE-2026-42563Public exploitNetwork attack vector

Arbitrary command execution via unquoted merge path

Published Jun 10, 2026 · Updated Jun 10, 2026

Command injection in Dulwich 0.24.0 through 1.2.4 allows remote attackers to execute arbitrary commands through a malicious Git branch. ProcessMergeDriver inserts the attacker-controlled tree path into the %P placeholder without quoting before passing the resulting string to subprocess.run with shell execution enabled. Exploitation requires a victim to merge the untrusted branch while a merge driver referencing %P is configured, and commands run with the victim process's privileges.

CVSS severity7.7
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Dulwich 0.24.0 through 1.2.4 allows remote attackers to execute arbitrary commands through a malicious Git branch. ProcessMergeDriver inserts the attacker-controlled tree path into the %P placeholder without quoting before passing the resulting string to subprocess.run with shell execution enabled. Exploitation requires a victim to merge the untrusted branch while a merge driver referencing %P is configured, and commands run with the victim process's privileges.

The record

CVE
CVE-2026-42563
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Jelmer Vernooij
Product
Dulwich
Classifications
CWE-78, T1059, 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=>= 0.24.0, < 1.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jelmer Vernooij · Dulwichversion=>= 0.24.0, < 1.2.5

Published CVSS scores

7.7GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter
T1204.002Malicious File

Public exploit references

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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