CVE-2026-49852 joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)

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...

CVE-2026-49852

Summary: CVE-2026-49852 affects the Python library joserfc. Prior to version 1.6.8, joserfc.jwt.decode can accept attacker-forged HS256/HS384/HS512 tokens if the verification key is empty or None, enabling potential authentication bypass when the configured secret resolves to an empty string. The...

PYSEC-2026-2528 joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)

Summary joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None. HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/rfc7518/jwsalgs.py:62-70 feed whatever OctKey.getopkey... produced into hmac.new..., and...

PYSEC-2026-2530 joserfc: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization

RFC7797 b64=false JWS payloads bypass JWSRegistry payload-size limits during deserialization Summary Testing revealed that joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.maxpayloadlength. The normal JWS compact and flattened JSON paths reject payloads above...

PYSEC-2026-2529 joserfc's PBES2 p2c Unbounded Iteration Count enables Denial of Service (DoS)

Summary A resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service DoS via CPU exhaustion. When the library decrypts a JSON Web Encryption JWE token using Password-Based Encryption PBES2 algorithms, it reads the p2c PBES2 Count parameter directl...

openSUSE 16 Security Update : python-joserfc (openSUSE-SU-2026:21263-1)

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:21263-1 advisory. Changes in python-joserfc: - CVE-2026-49852: HS256/HS384/HS512 verify accepts empty/nil HMAC key bsc1270234 Tenable has extracted the preceding...

ROOT-APP-PYPI-CVE-2026-27932 CVE-2026-27932 in rootio-joserfc - Patched by Root

Root has patched CVE-2026-27932 in the rootio-joserfc package for Root:PyPI. Multiple fixed versions available...

ROOT-APP-PYPI-CVE-2026-49852 CVE-2026-49852 in rootio-joserfc - Patched by Root

Root has patched CVE-2026-49852 in the rootio-joserfc package for Root:PyPI. Multiple fixed versions available...

python313-joserfc-1.7.2-2.1 on GA media (moderate)

python313-joserfc-1.7.2-2.1 on GA media Announcement ID: openSUSE-SU-2026:11183-1 Rating: moderate Cross-References: CVE-2026-49852 Affected Products: openSUSE Tumbleweed An update that solves one vulnerability can now be installed. Description: These are all security issues fixed in the...

OPENSUSE-SU-2026:11183-1 python313-joserfc-1.7.2-2.1 on GA media

These are all security issues fixed in the python313-joserfc-1.7.2-2.1 package on the GA media of openSUSE Tumbleweed...

CVE-2026-49852

creationtimestamp| type| source ---|---|--- 2026-07-02 20:35:04+00:00| published-proof-of-concept| https://github.com/authlib/joserfc/security/advisories/GHSA-gg9x-qcx2-xmrh 2026-07-17 22:08:26+00:00| seen| https://bsky.app/profile/cve.skyfleet.blue/post/3mqur7v4av42e...

Inadequate Encryption Strength

Overview Affected versions of this package are vulnerable to Inadequate Encryption Strength in the verify process. An attacker can gain unauthorized access and forge arbitrary claims by submitting tokens signed with an empty or null key, which are incorrectly accepted as valid signatures. This is...

GHSA-GG9X-QCX2-XMRH joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)

Summary joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None. HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/rfc7518/jwsalgs.py:62-70 feed whatever OctKey.getopkey... produced into hmac.new..., and...

PT-2026-55459

Name of the Vulnerable Software and Affected Versions joserfc versions 1.6.7 and earlier Description An authentication bypass exists when the verification key provided to joserfc.jwt.decode is an empty string or None. This occurs because the HMACAlgorithm.verify and HMACAlgorithm.sign functions...

EUVD-2026-37805

joserfc: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization...

GHSA-WPHV-VFRH-23Q5 joserfc: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization

RFC7797 b64=false JWS payloads bypass JWSRegistry payload-size limits during deserialization Summary Testing revealed that joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.maxpayloadlength. The normal JWS compact and flattened JSON paths reject payloads above...

Linux Distros Unpatched Vulnerability : CVE-2026-48990

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. In versions 1.3.4 through 1.6.5, joser...

OPENSUSE-SU-2026:11067-1 python311-joserfc-1.7.1-1.1 on GA media

These are all security issues fixed in the python311-joserfc-1.7.1-1.1 package on the GA media of openSUSE Tumbleweed...

CVE-2026-48990

A flaw was found in joserfc, a Python library for JSON Object Signing and Encryption JOSE. This vulnerability allows a remote attacker to cause resource exhaustion, leading to a Denial of Service DoS, by sending oversized JSON Web Signature JWS payloads. The library fails to apply size limits,...

CVE-2026-48990

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.maxpayloadlength, which can lead to resource exhaustion...