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OpenBao: LDAPi ldaputil (wrong escape func)

Type: advisorySource: OSV1 source record

## 1. Description ### Component `sdk/helper/ldaputil/client.go` — the shared LDAP utility library used by both the LDAP authentication backend and OpenLDAP secrets engine to construct LDAP search filters and bind DNs. ### Root Cause The LDAP utility contains a **function selection error** that causes incorrect escaping of user-controlled input in LDAP filter construction. Two lines construct the `bindDN` using `EscapeLDAPValue()`: ```go // Line 191 — UPN Domain path bindDN = fmt.Sprintf("%s@%s", EscapeLDAPValue(username), cfg.UPNDomain) // Line 193 — User DN path bindDN = fmt.Sprintf("%s=%s,%s", cfg.UserAttr, EscapeLDAPValue(username), cfg.UserDN) ``` The problem: `EscapeLDAPValue()` implements **RFC 4514** escaping, which is designed for Distinguished Name (DN) components. It only escapes characters meaningful in DNs: `+`, `,`, `;`, `"`, `\`, `<`, `>`, and leading/trailing spaces. LDAP **search filters** (RFC 4515) have a different set of special characters: `*`, `(`, `)`, `\`, and NUL (`\x00`). None of these are escaped by `EscapeLDAPValue()`. The correct function is `ldap.EscapeFilter()` from the `github.com/go-ldap/ldap/v3` package. The irony: the same file uses `ldap.EscapeFilter()` correctly at lines 225-226 in `RenderUserSearchFilter()` for the `UserFilter` template path, but the `GetUserDN()` function at lines 191-193 uses the wrong escape function. ### Exploitation Mechanics ``` Username: alice)(objectClass=* ↓ EscapeLDAPValue (no-op — no DN special chars) alice)(obj

Announced Source revision 1
Original source ↗

GHSA-6mwx-4547-5vc9

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:GHSA-6mwx-4547-5vc9

github.com/openbao/openbao

Source reference: /affected/0/package/name

Affected versions
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Fixed versions
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Prerequisites
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github.com/openbao/openbao

Source reference: /affected/1/package/name

Affected versions
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Fixed versions
0.0.0-20260617104213-10b7825c714c

Source reference: /affected/1/ranges

Prerequisites
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Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0.1.0"
          },
          {
            "last_affected": "2.5.4"
          }
        ]
      }
    ],
    "package": {
      "name": "github.com/openbao/openbao",
      "purl": "pkg:golang/github.com/openbao/openbao",
      "ecosystem": "Go"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6mwx-4547-5vc9/GHSA-6mwx-4547-5vc9.json"
    }
  },
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.0.0-20260617104213-10b7825c714c"
          }
        ]
      }
    ],
    "package": {
      "name": "github.com/openbao/openbao",
      "purl": "pkg:golang/github.com/openbao/openbao",
      "ecosystem": "Go"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6mwx-4547-5vc9/GHSA-6mwx-4547-5vc9.json"
    }
  }
]
Related CVEs
CVE-2026-55770

Source reference: /aliases

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Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-55770 · Medium

openbao

Event
#15293 · Revision 1
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