Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.
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This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 45% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Token validation methods are susceptible to a timing side-channel during HMAC comparison. With a large enough number of requests over a low latency connection, an attacker may use this to determine the expected HMAC.
December 27, 2022
April 11, 2025
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/robbert229/jwt | — | 0.0.0-20170426191122-ca1404ee6e83 | — |
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
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