http4k is a functional toolkit for Kotlin HTTP applications. Prior to 4.51.0.0, 5.42.0.0, and 6.50.0.0, DigestAuthProvider.verify in http4k-security-digest ignores its configured algorithm parameter and verifies every Digest response with hardcoded MD5. Deployments configured for SHA-256 therefore receive weaker MD5-based verification, exposing Digest authentication to collision-related attack paths that depend on the hash function's collision resistance. This issue is fixed in versions 4.51.0.0, 5.42.0.0, and 6.50.0.0.
CVE-2026-54147
MEDIUMPre-NVD 6.56.5
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(low)
- EG Risk
- 29(Track)EG Risk 29/100SSVC: 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 computedSeverity65% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
August 17, 2026
Last Modified
September 18, 2026
Advisory Details (3)
Auto-updated Sep 18, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
`DigestAuthProvider.verify` ignored configured algorithm · Advisory · http4k/http4k · GitHub
https://github.com/http4k/http4k/security/advisories/GHSA-vxxm-wwqh-mh47github_release Patch Available
6.50.0.0
Patch available: http4k/http4k 6.50.0.0
https://github.com/http4k/http4k/releases/tag/6.50.0.0github_commit Patch Available
commit 65d23d99fc5a (http4k/http4k)
Patch available: http4k/http4k 6.50.0.0 (contains commit 65d23d99fc5a)
https://github.com/http4k/http4k/commit/65d23d99fc5afbe34f29d8f61d0a003fbebb381cVendor Advisories for CVE-2026-54147(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)
Maven(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| org.http4k:http4k-security-digest | 4.10.0.0.0 ... v6.4.1.0 (153 versions) | 5.42.0.0 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× 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 18:33 UTCEG score recompute
- 2026-09-18 17:34 UTCEG score recompute
- 2026-09-18 16:27 UTCEG score recompute
- 2026-08-17 22:02 UTCEG score recompute
Frequently asked(4)
What is CVE-2026-54147?
CVE-2026-54147 is a medium vulnerability published on August 17, 2026. http4k is a functional toolkit for Kotlin HTTP applications. Prior to 4.51.0.0, 5.42.0.0, and 6.50.0.0, DigestAuthProvider.verify in http4k-security-digest ignores its configured algorithm parameter and verifies every Digest response with hardcoded MD5. Deployments configured for SHA-256 therefore…
When was CVE-2026-54147 disclosed?
CVE-2026-54147 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54147?
CVE-2026-54147 has a CVSS v3 base score of 6.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54147?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54147, 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-2026-54147
Is Your Infrastructure Affected by CVE-2026-54147?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.