SEPTEMBER 17, 2026
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Case File

CVE-2026-55776

MEDIUM · CVSS 6.5 EPSS 0.46% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

OpenBao versions prior to 2.5.5 are vulnerable to a denial-of-service attack, where an authenticated user with write access can cause the server to crash by improperly configuring derived keys for asymmetric types. This vulnerability arises from a double-unlocking of a mutex in the key management process, leading to a server panic and no HTTP response. Organizations using OpenBao for secrets management should prioritize upgrading to version 2.5.5 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55776
Severity
MEDIUM
CVSS
6.5
EPSS
0.46%

Original NVD 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.