What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• 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: 2026-09-15 · updated 2026-09-29
• Weakness: CWE-617

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 products

• openbao: before 2.5.5

References

• https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9
• https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5
• https://github.com/openbao/openbao/pull/3309
• https://github.com/openbao/openbao/pull/3312
• https://github.com/openbao/openbao/releases/tag/v2.5.5
• https://github.com/openbao/openbao/releases/tag/v2.6.0
• https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j
• https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j

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