Vulnerability-Lookup

GHSA-R39R-WW5M-7MV9

Vulnerability from github – Published: 2026-09-27 03:31 – Updated: 2026-09-27 03:31

Details

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.

Severity

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-100834"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-294"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-27T02:17:21Z",
    "severity": "HIGH"
  },
  "details": "http4k\u0027s 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 \u0027Authorization: Digest\u0027 response (for example by observing network traffic or reading logs) can replay it indefinitely against the same protected resource.",
  "id": "GHSA-r39r-ww5m-7mv9",
  "modified": "2026-09-27T03:31:04Z",
  "published": "2026-09-27T03:31:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4k/http4k/security/advisories/GHSA-c7jm-38gq-h67h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-100834"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4k/http4k/commit/4f904b4692"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4k/http4k/commit/8a52b615b1"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/http4k-before-6.48.0.0-digest-authentication-replay-protection-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-100834 (GCVE-0-2026-100834)

Vulnerability from cvelistv5 – Published: 2026-09-27 01:28 – Updated: 2026-09-30 17:03

Title

http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass

Summary

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 17:03 UTC

CWE

CWE-294 - Authentication Bypass by Capture-replay

Assigner

VulnCheck mitre root Scorecard

References

4 references

URL	Tags
https://github.com/http4k/http4k/security/advisor…	vendor-advisory
https://github.com/http4k/http4k/commit/8a52b615b1	patch
https://github.com/http4k/http4k/commit/4f904b4692	patch
https://www.vulncheck.com/advisories/http4k-befor…	third-party-advisory

Impacted products

3 products

Vendor	Product	Version
http4k	http4k	Affected: 0 , < 6.48.0.0 (custom) Unaffected: 6.48.0.0 (custom)
http4k	http4k	Affected: 0 , < 5.42.0.0 (custom) Unaffected: 5.42.0.0 (custom)
http4k	http4k	Affected: 0 , < 4.51.0.0 (custom) Unaffected: 4.51.0.0 (custom)

Date Public

2026-06-16 00:00

Show details on NVD website

JSON

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                "id": "CVE-2026-100834",
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T17:03:50.406355Z",
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            "Recovery": "NOT_DEFINED",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-R39R-WW5M-7MV9

CVE-2026-100834 (GCVE-0-2026-100834)

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Sightings

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