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EUVD-2026-339047

fkie_cve-2026-9537

Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.

The decode() method compares the supplied signature to the recomputed HMAC with Perl's eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.

A caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.

GHSA-3rp9-gq85-w2mf

Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.

A caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.

openSUSE-SU-2026:11450-1 — perl-Mojo-JWT-1.20.0-2.1 on GA media

perl-Mojo-JWT-1.20.0-2.1 on GA media

UBUNTU-CVE-2026-9537

Affected: Ubuntu:18.04:LTS: libmojo-jwt-perl, Ubuntu:20.04:LTS: libmojo-jwt-perl, Ubuntu:22.04:LTS: libmojo-jwt-perl, Ubuntu:24.04:LTS: libmojo-jwt-perl, Ubuntu:26.04:LTS: libmojo-jwt-perl

Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison. The decode() method compares the supplied signature to the recomputed HMAC with Perl's eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes. A caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.