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TI-2026-40265 Aliases CVE-2026-55776GHSA-8w8f-r2xv-4q4j

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

Priority MEDIUM 62CWE-617Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-617.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00612 49th percentileScored 2026-11-07
Fix Fixed openbao (openbao): 2.5.5github.com/openbao/openbao (Go): 0.0.0-20260617104123-db57c62602b2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openbaoopenbaobefore 2.5.52.5.5Patch availableCNA
—github.com/openbao/openbao (Go)0.1.0 – 2.5.4—No fix listedGHSA-8w8f-r2xv-4q4j
—github.com/openbao/openbao (Go)before 0.0.0-20260617104123-db57c62602b20.0.0-20260617104123-db57c62602b2Patch availableGHSA-8w8f-r2xv-4q4j
  • openbao Vendoropenbao Affected before 2.5.5 Fixed in 2.5.5 Patch available CNA
  • github.com/openbao/openbao (Go) Vendor— Affected 0.1.0 – 2.5.4 Fixed in — No fix listed GHSA-8w8f-r2xv-4q4j
  • github.com/openbao/openbao (Go) Vendor— Affected before 0.0.0-20260617104123-db57c62602b2 Fixed in 0.0.0-20260617104123-db57c62602b2 Patch available GHSA-8w8f-r2xv-4q4j

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:*——openbao
  • cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:* Versions — — ·openbao

Remediation

  • Fix · CNA openbao (openbao) Fixed in 2.5.5
  • Fix · GHSA-8w8f-r2xv-4q4j github.com/openbao/openbao (Go) Fixed in 0.0.0-20260617104123-db57c62602b2 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55776
  2. 2026-10-03 Alias added: GHSA-8w8f-r2xv-4q4j

References

Other 8

  • TI-2024-01904 Vault Cert Auth Method Did Not Correctly Validate Non-CA Certificates CVSS 3.1CRITICAL 9.8
  • TI-2026-34075 OpenBao's Inline Auth Incorrectly Redacted Headers CVSS 4.0MEDIUM 5.4
  • TI-2026-40259 OpenBao: LDAPi ldaputil (wrong escape func) CVSS 3.1MEDIUM 6.8
  • TI-2026-28381 OpenBao has Decompression Bomb via Unbounded Copy in OCI Plugin Extraction (DoS) CVSS 3.1MEDIUM 6.5
  • TI-2026-45068 OpenBao's Recovery Mode Vulnerable To Token Leakage via Timing Attack CVSS 4.0CRITICAL 9.2
  • TI-2026-26136 OpenBao lacks user confirmation for OIDC direct callback mode CVSS 3.1CRITICAL 9.6
See all 48 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences