CVE-2025-40920

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2025-08-11. NVD baseline CVSS 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl generate nonces using the Perl Data::UUID library. * Data::UUID does not use a strong cryptographic source for generating UUIDs. * Data::UUID returns v3 UUIDs, which are generated from known information and are unsuitable for security, as per RFC 9562. * The nonces should be generated from a strong cryptographic source, as per RFC 7616.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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 computed
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 11, 2025

Last Modified

April 15, 2026

Advisory Details (7)

Auto-updated Sep 1, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

oss-security - CVE-2025-40920: Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl use insecurely generated nonces

http://www.openwall.com/lists/oss-security/2025/08/12/1
generic
https://security.metacpan.org/patches/C/Catalyst-Authentication-Credential-HTTP/1.018/CVE-2025-40920-r1.patch
generic

lib/Catalyst/Authentication/Credential/HTTP.pm - metacpan.org

https://metacpan.org/release/ETHER/Catalyst-Authentication-Credential-HTTP-1.018/source/lib/Catalyst/Authentication/Credential/HTTP.pm#L391
github_pr

Use Crypt::SysRandom to generate nonces instead of Data::UUID

Fix merged in perl-catalyst/Catalyst-Authentication-Credential-HTTP PR #1 on 2025-08-04 — awaiting tagged release

https://github.com/perl-catalyst/Catalyst-Authentication-Credential-HTTP/pull/1
github_commit

commit ad2c03aad954 (perl-catalyst/Catalyst-Authentication-Credential-HTTP)

Fix landed in perl-catalyst/Catalyst-Authentication-Credential-HTTP commit ad2c03aad954 — awaiting tagged release

https://github.com/perl-catalyst/Catalyst-Authentication-Credential-HTTP/commit/ad2c03aad95406db4ce35dfb670664ebde004c18
generic

RFC 9562 - Universally Unique IDentifiers (UUIDs)

https://datatracker.ietf.org/doc/html/rfc9562#name-security-considerations
generic

RFC 7616 - HTTP Digest Access Authentication

https://datatracker.ietf.org/doc/html/rfc7616#section-5.12

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libcatalyst-authentication-credential-http-perl1.018-1, 1.018-2, 1.018-3, 1.018-4, 1.019-1——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libcatalyst-authentication-credential-http-perl1.018-2, 1.018-3, 1.018-4, 1.019-1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libcatalyst-authentication-credential-http-perl1.018-3, 1.018-4, 1.019-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libcatalyst-authentication-credential-http-perl1.018-31.018-4—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 19:29 UTCEPSS rescore
  3. 2026-09-16 19:50 UTCOSV refresh
  4. 2026-09-16 14:07 UTCEPSS rescore
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  20. 2026-08-28 21:40 UTCEPSS rescore
  21. 2026-08-28 19:53 UTCOSV refresh
  22. 2026-08-27 14:24 UTCEPSS rescore
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  24. 2026-08-25 13:48 UTCEPSS rescore
  25. 2026-08-23 00:18 UTCEPSS rescore
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  1. 2026-08-21 23:48 UTCEPSS rescore
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  5. 2026-08-18 13:47 UTCEPSS rescore
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  8. 2026-08-16 02:13 UTCEPSS rescore
  9. 2026-08-15 01:29 UTCEPSS rescore
  10. 2026-08-13 21:59 UTCEPSS rescore
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-12 08:17 UTCOSV refresh
  13. 2026-08-09 13:46 UTCEPSS rescore
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  23. 2026-07-30 01:29 UTCEPSS rescore
  24. 2026-07-28 15:35 UTCEPSS rescore
  25. 2026-07-27 14:57 UTCOSV refresh
  26. 2026-07-26 14:54 UTCEPSS rescore
  27. 2026-07-25 14:17 UTCEPSS rescore
  28. 2026-07-25 14:17 UTCEPSS rescore
  29. 2026-07-24 14:17 UTCEPSS rescore
  30. 2026-07-23 02:55 UTCEG score recompute
  31. 2026-07-22 14:07 UTCEPSS rescore
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  48. 2026-07-11 08:27 UTCEPSS rescore
  49. 2026-07-11 08:27 UTCEPSS rescore
  50. 2026-07-10 07:58 UTCOSV refresh
  51. 2026-07-09 19:09 UTCEPSS rescore
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  54. 2026-07-06 16:27 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-40920?
CVE-2025-40920 is a high vulnerability published on August 11, 2025. Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl generate nonces using the Perl Data::UUID library. Data::UUID does not use a strong cryptographic source for generating UUIDs. Data::UUID returns v3 UUIDs, which are generated from known information and are unsuitable…
When was CVE-2025-40920 disclosed?
CVE-2025-40920 was first published in the National Vulnerability Database on August 11, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-40920 actively exploited?
CVE-2025-40920 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 64.8% of all scored CVEs.
What is the CVSS score of CVE-2025-40920?
CVE-2025-40920 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2025-40920?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-40920, 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.

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