CVE-2026-71308
Authenticated user can suppress lifecycle and substitute TLS certificates across fleets.
Is CVE-2026-71308 being exploited?
Not confirmed. CVE-2026-71308 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 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-71308?
CVE-2026-71308 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-2026-71308?
Yes. A fix has been recorded for CVE-2026-71308. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71308 affect?
CVE-2026-71308 affects Lemur (Netflix) <1.9.3, Certificate management servers using Lemur, Endpoints using Lemur-managed TLS certificates. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71308?
Upgrade Lemur to >=1.9.3 and audit certificate replacements/rotations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated non-read-only user can authorize replacements without permission, suppress reissue, and deploy attacker certs to endpoints enabling fleet-wide TLS substitution/MITM.
Immediate action required
- affected>= 0.5.0 and < 1.9.3
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.