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CVE-2026-76220VulnerabilityPublished Updated

snakemake · GitPython: Unsafe git option guard bypass via split_single_char_options=False short-option token smuggling enables

Affects snakemakeSource GCVE Database

0
Authoritative record:CVE-2026-76220· High 8.7

Not known to be exploited · CVSS 8.7 High : upgrade to 9.25.1 soon.

Data as of 26 Oct 2026, 19:27 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 9.25.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade snakemake to 9.25.1.

Affected software

ProductAffectedFixed in
Homebrewsnakemakepkg:brew/snakemakeOther threatsAffected
  • <9.25.1
Fixed in
  • 9.25.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in GitPython version 3.1.58 (fixed in 9.25.1 for snakemake as per established facts). Users should upgrade to this fixed version or later. The suggested fix involves modifying '_option_candidates' to emit value-derived candidates regardless of 'split_single_char_options' or running 'check_unsafe_options' on the fully transformed argv. Until patched, avoid passing 'split_single_char_options=False' with single-character kwargs from untrusted sources.

Description

GitPython versions up to 3.1.57 contain a vulnerability where the unsafe git option guard can be bypassed by using the 'split_single_char_options=False' parameter combined with a single-character keyword argument. This bypass allows arbitrary OS command execution via the '--upload-pack' git option, despite the default safety setting 'allow_unsafe_options=False'. The flaw is due to incomplete validation of joined short-option tokens, enabling command injection in methods like clone, fetch, pull, and others that forward kwargs.

References

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