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

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao 是一款基于身份的开源密钥管理系统。在 2.5.5 版本之前，拥有对 路径写权限的已认证 OpenBao 调用者，通过将 参数设置为 ，同时 参数选择 、 或 ，可以终止服务器进程。 在 和 中的 Transit 策略创建路径在处理这种无效的“非对称派生密钥”组合时，可能触发一个错误路径，导致对同一互斥锁（mutex）执行双重解锁，从而引发 panic、HTTP 响应缺失、进程退出，最终造成拒绝服务（DoS）。 通过 JSON 或 HCL 格式的密钥创建请求均可表达该触发条件。此问题已在 2.5.5

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-55776

Vulnerability Information
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Vulnerability Title
OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.5 -

II. Public POCs for CVE-2026-55776

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III. Intelligence Information for CVE-2026-55776

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Patches & Fixes for CVE-2026-55776 (2)

Vendor Advisories for CVE-2026-55776 (1)

Vendor Pages for CVE-2026-55776 (2)

Same Patch Batch · openbao · 2026-09-15 · 4 CVEs total

CVE-2026-55770 6.8 MEDIUM OpenBao: LDAPi ldaputil (wrong escape func)
CVE-2026-55775 2.3 LOW OpenBao's System Backend allows Unauthorized Management of the containing Namespace
CVE-2026-55774 2.1 LOW OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew}

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-617

V. Comments for CVE-2026-55776

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