joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| authlib | joserfc | affected |
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| Authlib | Joserfc |
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| Source | ID | Title |
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Github GHSA |
GHSA-gg9x-qcx2-xmrh | joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363) |
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.171% probability within 30 days)
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ssvc
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| First Time appeared |
Authlib
Authlib joserfc |
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| Vendors & Products |
Authlib
Authlib joserfc |
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| Description | joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWarning for keys shorter than 14 bytes without rejecting zero-length input. This issue is fixed in version 1.6.8. | |
| Title | joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363) | |
| Weaknesses | CWE-1391 CWE-287 CWE-326 |
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| References |
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| Metrics |
cvssV4_0
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