Log in Start free

Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

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

Medium 6.8

In plain English

A medium-severity security flaw in openbao from openbao. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)0.5%top 55.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/openbao/openbaono fix listedGHSA-6mwx-4547-5vc9
Gogithub.com/openbao/openbao0.0.0-20260617104213-10b7825c714cGHSA-6mwx-4547-5vc9
Gogithub.com/openbao/openbao0.0.0-20260617104213-10b7825c714cGO-2026-5182

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.5.5

Weakness: CWE-90 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References