{"schemaVersion":3,"id":"CVE-2026-49852","aliases":["GHSA-gg9x-qcx2-xmrh","PYSEC-2026-2528","RHSA-2026:42045","UBUNTU-CVE-2026-49852","DEBIAN-CVE-2026-49852","CGA-cxv4-wg44-w8j2","CGA-j8fx-wcp9-fp3q","openSUSE-SU-2026:11183-1","openSUSE-SU-2026:21263-1","CGA-4mpm-794q-4c7v","CGA-84pw-q6rm-487g"],"status":"published","duplicateOf":null,"title":null,"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. 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