CVE-2026-110856 gitpython-developers CVE debrief

Who should care

Defenders responsible for GitPython deployments, particularly those using versions before 3.2.0, should assess exposure and prioritize updates to mitigate this vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify GitPython versions, review repository access, and monitor system performance to prevent potential exploitation attempts.

Why it matters

Defenders should care about CVE-2026-110856 because it affects GitPython versions before 3.2.0, potentially leading to denial of service through CPU exhaustion. Verification of versions and updates to 3.2.0 or later are necessary to mitigate this vulnerability.

• Potential CPU exhaustion due to quadratic backtracking
• Denial of service vulnerability in GitPython
• Need for verification of GitPython versions and updates

Technical summary

The vulnerability exists in the _re_actor_epoch pattern used by parse_actor_and_date in GitPython before 3.2.0. This pattern can lead to quadratic backtracking and CPU exhaustion when processing commit or tag objects with long space-filled lines lacking a valid epoch or timezone. The issue affects GitPython deployments, particularly those using versions before 3.2.0, and can cause denial of service through CPU exhaustion. Defenders should prioritize verifying GitPython versions and updating to 3.2.0 or later to mitigate this vulnerability.

Defensive priority

Defenders should prioritize verifying GitPython versions and updating to 3.2.0 or later to mitigate this vulnerability.

Recommended defensive actions

• Verify GitPython versions and update to 3.2.0 or later
• Review and restrict repository access to trusted sources
• Monitor system performance and CPU usage for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on potential exploitation or affected systems. Defenders should verify GitPython versions, review repository access, and monitor system performance. Evidence is limited, and further verification tasks are needed to assess exposure and potential impacts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.