OpenBao: LDAPi ldaputil (wrong escape func)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55770
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 16:17:15 UTC
Updated2026-09-17 12:18:24 UTC
DescriptionOpenBao 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.004470000 probability, percentile 0.383000000 (date 2026-09-23)

Problem Types: CWE-90 | CWE-90 CWE-90: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openbao Openbao affected < 2.5.5 Not specified

References

ReferenceSourceLinkTags
github.com/openbao/openbao/pull/3306 [email protected] github.com
github.com/openbao/openbao/releases/tag/v2.6.0 [email protected] github.com
github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c [email protected] github.com
github.com/openbao/openbao/releases/tag/v2.5.5 [email protected] github.com
github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659 [email protected] github.com
github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/openbao/openbao/pull/3313 [email protected] github.com
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