What is CVE-2026-115356?

CVE-2026-115356 is a medium-severity vulnerability in Openbao, classified under Insufficient Session Expiration. CVSS score: 5.4/10. Published 2026-10-22.

How severe is CVE-2026-115356?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Openbao

CVE-2026-115356

OpenBao before 2.6.4 and 2.7.x before 2.7.1 does not verify, when renewing a token issued by the Kubernetes Auth method, that the service account token originally used to authenticate is still valid. An authenticated attacker can keep renewing such tokens to persist access after the Kubernetes service account has been deleted.

Published 2026-10-22.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openbao

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/openbao/openbao/security/advisories/GHSA-gf3j-hm38-jhh5 (vendor-advisory)
www.vulncheck.com/advisories/openbao-before-2.6.4-and-2.7.0-before-2.7.1-kubern… (third-party-advisory)

Frequently asked questions

What is CVE-2026-115356?: CVE-2026-115356 is a medium-severity vulnerability in Openbao, classified under Insufficient Session Expiration. CVSS score: 5.4/10. Published 2026-10-22.
How severe is CVE-2026-115356?: Medium severity. CVSS v3 base score is 5.4 out of 10.