LDAP injection in OpenBao - CVE-2026-55770
Published: August 19, 2026
Vulnerability identifier: #VU144303
CSH Severity: Low
CVSS v4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55770
CWE-ID: CWE-90
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information and modify data by impersonating a different LDAP user.
The vulnerability exists due to improper neutralization of special elements used in an LDAP query in sdk/helper/ldaputil/client.go when constructing LDAP search filters from the username field during login. A remote user can supply a specially crafted username value to disclose sensitive information and modify data by causing OpenBao to bind a token to a different LDAP user.
Exploitation requires the LDAP authentication backend to be configured and the deployment to use Active Directory or UserDN/UserAttr binding.
Affected software
OpenBao
Fedora
openbao
Fedora
openbao
How to mitigate CVE-2026-55770
Install security update from vendor's website.
OpenBao - update to 2.5.5
openbao - addressed in versions 2.5.5-1.el8, 2.5.5-1.el9, 2.5.5-1.el10_2, 2.5.5-1.el10_3, 2.5.5-1.fc43, 2.5.5-1.fc44
openbao - addressed in versions 2.5.5-1.el8, 2.5.5-1.el9, 2.5.5-1.el10_2, 2.5.5-1.el10_3, 2.5.5-1.fc43, 2.5.5-1.fc44