CVE-2026-55770

MEDIUMPre-NVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-78683 (ENISA EUVD) · GHSA-6mwx-4547-5vc9 (GitHub Security Advisories) · GO-2026-5182 (OSV.dev)Source: ENISA EUVD

6.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.

EG Severity
6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 19, 2026

Last Modified

September 29, 2026

Advisory Details (5)

Auto-updated Sep 15, 2026
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 pull request

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 pull request

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 advisoryMentions a patch (unverified)

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 rangeFix by version rangeDependents
github.com/openbao/openbao—
  • 0.1.0 through 2.5.4: no fix on record
  • every version up to 0.0.0-20260617104213-10b7825c714c: fixed in 0.0.0-20260617104213-10b7825c714c
  • 0.1.0 on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-30 10:55 UTCOSV refresh
  3. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  7. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-10-25 14:18 UTCEG score recompute
  9. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-22 21:14 UTCEG score recompute
  12. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-18 03:30 UTCEG score recompute
  18. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-12 15:55 UTCEG score recompute
  25. 2026-10-11 19:38 UTCEG score recompute
Show 35 more
  1. 2026-10-11 16:53 UTCEG score recompute
  2. 2026-10-11 14:16 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-09-29 19:26 UTCEG score recompute
  16. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  22. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  25. 2026-09-17 12:20 UTCEG score recompute
  26. 2026-09-17 12:10 UTCEG score recompute
  27. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  28. 2026-09-16 04:22 UTCEG score recompute
  29. 2026-09-15 17:34 UTCEG score recompute
  30. 2026-09-15 16:43 UTCEG score recompute
  31. 2026-09-15 16:36 UTCEG score recompute
  32. 2026-07-31 03:47 UTCEG score recompute
  33. 2026-07-26 16:46 UTCEG score recompute
  34. 2026-07-23 03:20 UTCEG score recompute
  35. 2026-06-19 22:24 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-55770?
CVE-2026-55770 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-55770 published?
The CVE record for CVE-2026-55770 was published on June 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 29, 2026; the record at its source may have been updated since.
Is CVE-2026-55770 actively exploited?
CVE-2026-55770 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55770?
CVE-2026-55770 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55770?
A fix for CVE-2026-55770 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55770 are linked in the Vendor Advisories panel on this page.

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