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TI-2026-40259 Aliases CVE-2026-55770GHSA-6mwx-4547-5vc9

OpenBao: LDAPi ldaputil (wrong escape func)

Priority HIGH 65CWE-90Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, OpenBao used EscapeLDAPValue, an RFC 4514 distinguished-name escaping function, where RFC 4515 LDAP search-filter escaping was required in sdk/helper/ldaputil/client.go GetUserDN. With the LDAP authentication backend configured for an Active Directory UPNDomain path or UserDN and UserAttr binding, an attacker-controlled username containing filter metacharacters could alter the search predicate and select a different directory entry because EscapeLDAPValue does not neutralize the characters handled by ldap.EscapeFilter. A resulting token could be associated with another LDAP identity and gain access to secrets, policies, or modification capabilities assigned to that identity. This issue is fixed in version 2.5.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00525 44th percentileScored 2026-11-07
Fix Fixed openbao (openbao): 2.5.5github.com/openbao/openbao (Go): 0.0.0-20260617104213-10b7825c714c

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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-6mwx-4547-5vc9
—github.com/openbao/openbao (Go)before 0.0.0-20260617104213-10b7825c714c0.0.0-20260617104213-10b7825c714cPatch availableGHSA-6mwx-4547-5vc9
  • 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-6mwx-4547-5vc9
  • github.com/openbao/openbao (Go) Vendor— Affected before 0.0.0-20260617104213-10b7825c714c Fixed in 0.0.0-20260617104213-10b7825c714c Patch available GHSA-6mwx-4547-5vc9

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-6mwx-4547-5vc9 github.com/openbao/openbao (Go) Fixed in 0.0.0-20260617104213-10b7825c714c 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-2026-55770
  2. 2026-10-03 Alias added: GHSA-6mwx-4547-5vc9

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-2026-40265 OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types CVSS 3.1MEDIUM 6.5
  • 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