CVE-2026-63132: OpenBao's Recovery Mode Vulnerable To Token Leakage via Timing Attack

Severity: critical (CVSS 9.2 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-23 · updated 2026-09-29
Weakness: CWE-208

Description

OpenBao is an open source identity-based secrets management system. Prior to 2.6.0, OpenBao's handleLogicalRecovery path in http/logical.go compared the highly privileged recovery token with ordinary string equality. A remote unauthenticated attacker able to make repeated recovery mode requests and measure response timing could infer the recovery token. The recovered token could then authorize recovery mode operations that read or modify OpenBao data. This issue is fixed in version 2.6.0.

Affected products

openbao: before 2.6.0

References

https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#203
https://github.com/openbao/openbao/commit/0f2d90c331f25d1c6cd108638da03f4c7bd949a8
https://github.com/openbao/openbao/commit/763625a2072103ea9e9122f2a8408e0b988d287a
https://github.com/openbao/openbao/pull/3388
https://github.com/openbao/openbao/pull/3472
https://github.com/openbao/openbao/releases/tag/v2.6.0
https://github.com/openbao/openbao/security/advisories/GHSA-34fc-gh42-pj53

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