CVE-2026-9537
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
The vulnerability in Mojo::JWT for Perl before version 1.02 is that HMAC signature verification uses a non-constant-time string comparison. The decode() method uses Perl's eq operator, which compares bytes until the first differing one, causing variable response time depending on the number of matching leading bytes.
Risk Assessment
An attacker can leak the expected signature by sending many requests with JWT tokens and measuring response times, enabling signature recovery and token forgery. This could lead to unauthorized access to systems and data.
Recommendation
Immediately update the Mojo::JWT library to version 1.02 or later, which includes a fix that eliminates the timing attack vulnerability.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS