fix(jwt-auth): enforce algorithm match before signature verification#13182
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Baoyuantop merged 4 commits intoApr 21, 2026
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Verify that the JWT header's "alg" claim matches the consumer's configured algorithm before performing signature verification, per RFC 8725 Section 2.1. Signed-off-by: Abhishek Choudhary <[email protected]>
- Add nil guard on jwt.header before accessing alg to prevent potential nil index errors on malformed tokens - Remove untrusted token alg value from log message; only log the expected algorithm - Update test to match revised log message
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Signed-off-by: Abhishek Choudhary <[email protected]>
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…lgo-mismatch Signed-off-by: Abhishek Choudhary <[email protected]>
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Summary
algclaim matches the consumer's configured algorithm before performing signature verification, per RFC 8725 Section 2.1Test plan
t/plugin/jwt-auth.t): creates an RS256 consumer, submits a token with mismatched algorithm, asserts 401 rejection with correct error logprove -I. -Itest-nginx/lib -r t/plugin/jwt-auth.tpasses