What’s Vulnerable › Vulnerabilities

CVE-2026-55770: OpenBao: LDAPi ldaputil (wrong escape func)

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-29
• Weakness: CWE-90

Description

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.

Affected products

• openbao: before 2.5.5

References

• https://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659
• https://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c
• https://github.com/openbao/openbao/pull/3306
• https://github.com/openbao/openbao/pull/3313
• https://github.com/openbao/openbao/releases/tag/v2.5.5
• https://github.com/openbao/openbao/releases/tag/v2.6.0
• https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9
• https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9

Get alerted when CVE-2026-55770 or the next vulnerability affects your stack