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

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao 是一个基于身份的开源密钥管理系统。在 2.5.5 版本之前，OpenBao 在 中的 函数中使用了 函数（该函数用于 RFC 4514 指定名称的转义），但此处实际需要进行的是 RFC 4515 定义的 LDAP 搜索过滤器转义。 当 LDAP 认证后端配置为 Active Directory 的 UPNDomain 路径，或使用 UserDN 和 UserAttr 进行绑定时，攻击者若控制包含过滤器元字符（filter metacharacters）的用户名，就可能篡改搜索谓词，从而选中另一个目录

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-55770

Vulnerability Information
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Vulnerability Title
OpenBao: LDAPi ldaputil (wrong escape func)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.5 -

II. Public POCs for CVE-2026-55770

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III. Intelligence Information for CVE-2026-55770

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Patches & Fixes for CVE-2026-55770 (4)

Vendor Advisories for CVE-2026-55770 (1)

Vendor Pages for CVE-2026-55770 (2)

Same Patch Batch · openbao · 2026-09-15 · 4 CVEs total

CVE-2026-55776 6.5 MEDIUM OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetri
CVE-2026-55775 2.3 LOW OpenBao's System Backend allows Unauthorized Management of the containing Namespace
CVE-2026-55774 2.1 LOW OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew}

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-90

V. Comments for CVE-2026-55770

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