CVE-2026-53658

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (36th percentile of EPSS-scored CVEs). 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
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fabric CA is a Certificate Authority for Hyperledger Fabric. Prior to 1.5.21, when fabric-ca is configured with an LDAP backend, Client.GetUser in lib/server/ldap/client.go inserts the username from HTTP Basic authentication into the LDAP uid search UserFilter without escaping LDAP metacharacters. An unauthenticated attacker with network access to the CA enrollment endpoint can alter the LDAP search before password validation and potentially steer authentication attempts toward a victim account. Deployments that do not use an LDAP backend are unaffected. This issue is fixed in version 1.5.21.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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
Severity63% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 14, 2026

Last Modified

September 30, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v1.5.21

Patch available: hyperledger/fabric-ca v1.5.21

https://github.com/hyperledger/fabric-ca/releases/tag/v1.5.21
github_commit

commit d379df823534 (hyperledger/fabric-ca)

Fix landed in hyperledger/fabric-ca commit d379df823534 — awaiting tagged release

https://github.com/hyperledger/fabric-ca/commit/d379df823534d56dec0166a6da8f0415e3beee24
github_pr

Escape LDAP user filter

Fix merged in hyperledger/fabric-ca PR #501 on 2026-05-29 — awaiting tagged release

https://github.com/hyperledger/fabric-ca/pull/501
github Patch Available

LDAP Injection via Unescaped Username in GetUser Filter · Advisory · hyperledger/fabric-ca · GitHub

https://github.com/hyperledger/fabric-ca/security/advisories/GHSA-xghw-p77p-3r7x

Vendor Advisories for CVE-2026-53658(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/hyperledger/fabric-ca—
  • every version up to 1.5.21: fixed in 1.5.21
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 33× 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. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-03 19:40 UTCEG score recompute
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-02 17:56 UTCEPSS rescore
  5. 2026-10-02 15:56 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 17:52 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 15:22 UTCEPSS rescore
  10. 2026-09-29 04:41 UTCEG score recompute
  11. 2026-09-28 13:51 UTCEPSS rescore
  12. 2026-09-28 06:49 UTCEG score recompute
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-27 09:03 UTCEG score recompute
  15. 2026-09-26 15:59 UTCEPSS rescore
  16. 2026-09-25 03:22 UTCEG score recompute
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-24 02:28 UTCEG score recompute
  19. 2026-09-23 17:54 UTCEPSS rescore
  20. 2026-09-23 04:45 UTCEG score recompute
  21. 2026-09-22 07:03 UTCEG score recompute
  22. 2026-09-21 09:20 UTCEG score recompute
  23. 2026-09-20 20:16 UTCEPSS rescore
  24. 2026-09-20 09:57 UTCEG score recompute
  25. 2026-09-19 11:10 UTCEG score recompute
Show 9 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 12:47 UTCEG score recompute
  3. 2026-09-16 16:58 UTCEG score recompute
  4. 2026-09-16 15:45 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-15 17:34 UTCEG score recompute
  7. 2026-09-15 16:43 UTCEG score recompute▲ 6.30
  8. 2026-09-15 16:42 UTCMITRE cvelistV5CVSS v3 → 6.3 · CVSS v4 → 6.3
  9. 2026-08-14 20:25 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53658?
CVE-2026-53658 is a medium vulnerability published on August 14, 2026. Fabric CA is a Certificate Authority for Hyperledger Fabric. Prior to 1.5.21, when fabric-ca is configured with an LDAP backend, Client.GetUser in lib/server/ldap/client.go inserts the username from HTTP Basic authentication into the LDAP uid search UserFilter without escaping LDAP metacharacters.…
When was CVE-2026-53658 disclosed?
CVE-2026-53658 was first published on August 14, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53658 actively exploited?
CVE-2026-53658 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53658?
CVE-2026-53658 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53658?
A fix for CVE-2026-53658 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53658 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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