CVE-2026-100834

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreHIGH confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-09-27. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

http4k's Digest authentication module (org.http4k:http4k-security-digest) before versions 6.48.0.0, 5.42.0.0 and 4.51.0.0 defaults the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to { true }, so every nonce is accepted regardless of its value, age, or prior use. Applications relying on this default have no replay protection on Digest authentication: an attacker who can capture a valid 'Authorization: Digest' response (for example by observing network traffic or reading logs) can replay it indefinitely against the same protected resource.

CVSS v3
5.9
EG Score
5.9MEDIUMhigh confidence
EG Risk
27
EG Risk 27/100CISA 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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

September 27, 2026

Last Modified

September 30, 2026

Advisory Details (4)

Auto-updated Sep 27, 2026
Patch available. Sources: github, github_commit.
generic

http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass
github_commit Patch Available

commit 4f904b4692 (http4k/http4k)

Patch available: http4k/http4k 6.48.0.0 (contains commit 4f904b4692)

https://github.com/http4k/http4k/commit/4f904b4692
github_commit Patch Available

commit 8a52b615b1 (http4k/http4k)

Patch available: http4k/http4k 6.39.0.0 (contains commit 8a52b615b1)

https://github.com/http4k/http4k/commit/8a52b615b1
github Patch Available

`ServerFilters.DigestAuth` / `DigestAuthProvider` defaulted to an always-true nonce verifier, disabling replay protection in default deployments · Advisory · http4k/http4k · GitHub

https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h

Vendor Advisories for CVE-2026-100834(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)
PackageVulnerable rangeFixed inDependents
org.http4k:http4k-security-digest6.0.0.0 ... 6.9.2.0 (89 versions)6.48.0.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 25× 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 00:26 UTCEG score recompute
  2. 2026-10-04 00:26 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-02 22:32 UTCEG score recompute
  5. 2026-10-02 22:32 UTCGHSA enrichment
  6. 2026-10-01 20:38 UTCEG score recompute
  7. 2026-10-01 20:38 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-09-30 18:41 UTCGHSA enrichment
  10. 2026-09-30 17:47 UTCEG score recompute
  11. 2026-09-30 17:47 UTCGHSA enrichment
  12. 2026-09-30 17:24 UTCEG score recompute
  13. 2026-09-30 17:24 UTCGHSA enrichment
  14. 2026-09-30 15:02 UTCEPSS rescore
  15. 2026-09-30 08:19 UTCEG score recompute
  16. 2026-09-30 08:19 UTCGHSA enrichment
  17. 2026-09-29 15:20 UTCEPSS rescore
  18. 2026-09-29 06:24 UTCEG score recompute
  19. 2026-09-29 06:24 UTCGHSA enrichment
  20. 2026-09-28 13:50 UTCEPSS rescore
  21. 2026-09-28 04:31 UTCEG score recompute
  22. 2026-09-28 04:31 UTCGHSA enrichment
  23. 2026-09-27 02:37 UTCEG score recompute
  24. 2026-09-27 01:53 UTCEG score recompute
  25. 2026-09-27 01:49 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Same product

2 shown

Maven:org.http4k:http4k-security-digest

Frequently asked(5)

What is CVE-2026-100834?
CVE-2026-100834 is a medium vulnerability published on September 27, 2026. http4k's Digest authentication module (org.http4k:http4k-security-digest) before versions 6.48.0.0, 5.42.0.0 and 4.51.0.0 defaults the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to { true }, so every nonce is accepted regardless of its value, age, or prior use.…
When was CVE-2026-100834 disclosed?
CVE-2026-100834 was first published on September 27, 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-2026-100834 actively exploited?
CVE-2026-100834 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100834?
CVE-2026-100834 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100834?
A fix for CVE-2026-100834 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100834 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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