# CVE-2026-55776

## Summary

- **CVE ID:** CVE-2026-55776
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-617
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## 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 — openbao (< 2.5.5)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._