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.
CVE-2026-53658
MEDIUMPre-NVD 6.36.3—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% 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
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.3
- EG Score
- 6.3(medium)
- EG Risk
- 43(Track)EG Risk 43/100SSVC: 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 computedSeverity63% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 18%
- KEV
- Not listed
Published
August 14, 2026
Last Modified
September 16, 2026
Advisory Details (4)
Auto-updated Sep 15, 2026Patch 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/v1.5.21github_commit
commit d379df823534 (hyperledger/fabric-ca)
Fix landed in hyperledger/fabric-ca commit d379df823534 — awaiting tagged release
https://github.com/hyperledger/fabric-ca/commit/d379df823534d56dec0166a6da8f0415e3beee24github_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/501github 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-3r7xVendor 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)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/hyperledger/fabric-ca | — | 1.5.21 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 8× 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.
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 12:47 UTCEG score recompute
- 2026-09-16 16:58 UTCEG score recompute
- 2026-09-16 15:45 UTCEG score recompute
- 2026-09-16 14:08 UTCEPSS rescore
- 2026-09-15 17:34 UTCEG score recompute
- 2026-09-15 16:43 UTCEG score recompute▲ 6.30
- 2026-09-15 16:42 UTCMITRE cvelistV5CVSS v3 → 6.3 · CVSS v4 → 6.3
- 2026-08-14 20:25 UTCEG score recompute
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 in the National Vulnerability Database on August 14, 2026, with the most recent update on September 16, 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% probability of exploitation in the next 30 days, which ranks it in the top 81.8% of all scored CVEs.
What is the CVSS score of CVE-2026-53658?
CVE-2026-53658 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-53658?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53658, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53658
Is Your Infrastructure Affected by CVE-2026-53658?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.