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Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

CVE-2026-55776OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types

Medium 6.5

In plain English

A medium-severity security flaw in openbao from openbao. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.6%top 50.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an authenticated OpenBao caller with write access to transit/keys/* could terminate the server process by setting derived to true while the type parameter selected rsa-, ecdsa-, or ed25519. The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP response, process exit, and denial of service. JSON and HCL key-creation requests can express the triggering combination. This issue is fixed in version 2.5.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/openbao/openbaono fix listedGHSA-8w8f-r2xv-4q4j
Gogithub.com/openbao/openbao0.0.0-20260617104123-db57c62602b2GHSA-8w8f-r2xv-4q4j
Gogithub.com/openbao/openbao0.0.0-20260617104123-db57c62602b2GO-2026-5267

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.5.5

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References