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PatchSiren cyber security CVE debrief

CVE-2026-8700 TIMLEGGE CVE debrief

Crypt::DSA versions before 1.20 for Perl generate cryptographic seeds using Perl's built-in `rand` function, which is not cryptographically secure. This weakness allows attackers who can observe or predict the seed values to potentially compromise DSA key generation, leading to reduced confidentiality, integrity, and availability of cryptographic operations. The vulnerability was addressed in version 1.20 by replacing the insecure random number generation.

Vendor
TIMLEGGE
Product
Crypt::DSA
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-15
Original CVE updated
2026-05-18
Advisory published
2026-05-15
Advisory updated
2026-05-18

Who should care

Organizations running Perl applications that use DSA cryptographic operations, particularly those handling sensitive data or authentication. System administrators maintaining Perl module inventories. Security teams responsible for cryptographic hygiene and key lifecycle management. Developers maintaining legacy Perl codebases with cryptographic dependencies.

Technical summary

The Crypt::DSA Perl module prior to version 1.20 used Perl's built-in `rand` function for generating seeds during DSA key generation. The `rand` function is not cryptographically secure and produces predictable sequences when the seed is known or can be inferred. This insufficient entropy (CWE-331) in seed generation undermines the security properties of DSA signatures and key pairs. Version 1.20 addresses this vulnerability by implementing cryptographically secure random number generation for seeds. The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L indicates network exploitable, low attack complexity, no privileges required, no user interaction, with low impacts across confidentiality, integrity, and availability.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade Crypt::DSA to version 1.20 or later to obtain cryptographically secure seed generation
  • Audit systems for Perl applications using DSA operations to identify affected Crypt::DSA versions
  • Review cryptographic key material generated with affected versions for potential compromise and regenerate if risk tolerance requires
  • Monitor for updates to NVD entry as vulnerability status is currently Deferred
  • Subscribe to oss-security mailing list for additional technical analysis

Evidence notes

CVE published 2026-05-15; modified 2026-05-18. NVD status: Deferred. CVSS 3.1 score 7.3 (HIGH). Weakness: CWE-331 (Insufficient Entropy). Fix confirmed in Crypt-DSA-1.20 changelog and code diff showing replacement of `rand`-based seed generation.

Official resources

2026-05-15