CVE-2026-58439
PR retargeting can bypass branch protection by preserving stale 'official' approvals.
Is CVE-2026-58439 being exploited?
Not confirmed. CVE-2026-58439 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.28% probability of exploitation in the next 30 days.
How severe is CVE-2026-58439?
CVE-2026-58439 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58439?
Yes. A fix has been recorded for CVE-2026-58439. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58439 affect?
CVE-2026-58439 affects Code hosting platforms (PR workflows), Branch protection rules, CI/CD pipelines relying on approvals. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58439?
Require re-approval on base changes, block PR retargeting, apply vendor patch when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows merging unauthorized changes into protected branches by retargeting PRs that retain stale 'official' approvals, enabling code injection and supply-chain risk.
Immediate action required
- affected<= 1.26.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.