CVE-2026-55770

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
47(Track*)
EG Risk 47/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

June 19, 2026

Last Modified

September 17, 2026

Advisory Details (5)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit.
github_commit

commit 8077f96bdc02 (openbao/openbao)

Fix landed in openbao/openbao commit 8077f96bdc02 — awaiting tagged release

https://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c
github_commit

commit 10b7825c714c (openbao/openbao)

Fix landed in openbao/openbao commit 10b7825c714c — awaiting tagged release

https://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659
github_pr

Fix LDAP bind DN lookups in auth, secrets engine (#3306)

Fix merged in openbao/openbao PR #3313 on 2026-06-17 — awaiting tagged release

https://github.com/openbao/openbao/pull/3313
github_pr

Fix LDAP bind DN lookups in auth, secrets engine

Fix merged in openbao/openbao PR #3306 on 2026-06-17 — awaiting tagged release

https://github.com/openbao/openbao/pull/3306
github Patch Available🟡 PoC Available

LDAPi ldaputil (wrong escape func) · Advisory · openbao/openbao · GitHub

https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9

Vendor Advisories for CVE-2026-55770(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/openbao/openbao—0.0.0-20260617104213-10b7825c714c—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:31 UTCEPSS rescore
  3. 2026-09-17 12:20 UTCEG score recompute
  4. 2026-09-17 12:10 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 04:22 UTCEG score recompute
  7. 2026-09-15 17:34 UTCEG score recompute
  8. 2026-09-15 16:43 UTCEG score recompute
  9. 2026-09-15 16:36 UTCEG score recompute
  10. 2026-07-31 03:47 UTCEG score recompute
  11. 2026-07-26 16:46 UTCEG score recompute
  12. 2026-07-23 03:20 UTCEG score recompute
  13. 2026-06-19 22:24 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-55770?
CVE-2026-55770 is a medium vulnerability published on June 19, 2026. 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…
When was CVE-2026-55770 disclosed?
CVE-2026-55770 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55770 actively exploited?
CVE-2026-55770 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.7% of all scored CVEs.
What is the CVSS score of CVE-2026-55770?
CVE-2026-55770 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-55770?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55770, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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