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ALSA-2026:25902 — Important: fence-agents security update

Affected: AlmaLinux:10: fence-agents-aliyun, AlmaLinux:10: fence-agents-all, AlmaLinux:10: fence-agents-amt-ws, AlmaLinux:10: fence-agents-apc, AlmaLinux:10: fence-agents-apc-snmp, AlmaLinux:10: fence-agents-aws, AlmaLinux:10: fence-agents-azure-arm, AlmaLinux:10: fence-agents-bladecenter, AlmaLinux:10: fence-agents-brocade, AlmaLinux:10: fence-agents-cisco-mds and 45 more

The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

Security Fix(es):

* python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

BELL-CVE-2026-48526

Affected: Alpaquita:25: py3-jwt, Alpaquita:stream: py3-jwt

BREW-azure-cli-CVE-2026-48526 — PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

Affected: Homebrew: azure-cli

> [!NOTE] > Exploitation requires a verifier configured with both symmetric and asymmetric algorithms in `algorithms=[…]` and a raw-JSON JWK as the `key=` argument, both contrary to documented usage, hence the High attack-complexity rating.

### Summary When the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm.

### Details In JWT algorithm confusion attack, the verifier is mistakenly use of public key to be used as the shared secret in symmetric algorithms. In pyjwt case, when the verifier is supporting both HMAC with other asymmetric algorithm and mistakenly using the public key of the issuer to verify the token as demonstrated in the following example: `jws.decode(token, key=rsa_jwk_json, algorithms=["HS256","RS256"])) `

An attacker who specifies in the token header to use HMAC, will cause the verifier to accept the JWK as the secret key in HMAC algorithm. The attacker will be able to forge JWT signed with the public key of the issuer to impersonate any user.

If we look on current protections implemented in the library, at class HMACAlgorithm:

``` def prepare_key(self, key: str | bytes) -> bytes: key_bytes = force_bytes(key)

if is_pem_format(key_bytes) or is_ssh_key(key_bytes): raise InvalidKeyError( "The specified key is…

Withdrawn: CLEANSTART-2026-AF67526 — Security fixes for CVE-2026-42304, CVE-2026-44307, CVE-2026-48522, CVE-2026-48523, CVE-2026-48524, CVE-2026-48525, CVE-…

Withdrawn by the publisher.

Affected: CleanStart: jupyterhub-k8s-hub

Multiple security vulnerabilities affect the jupyterhub-k8s-hub package. These issues are resolved in later releases. See references for individual vulnerability details.

EUVD-2026-366080

fkie_cve-2026-48526

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

GHSA-xgmm-8j9v-c9wx — PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

Affected: PyPI: pyjwt

If we look on current protections implemented in the library, at class HMACAlgorithm:

``` def prepare_key(self, key: str | bytes) -> bytes: key_bytes = force_bytes(key)

if is_pem_format(key_bytes) or is_ssh_key(key_bytes): raise InvalidKeyError( "The specified key is…

msrc_CVE-2026-48526 — PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

msrc_CVE-2026-48526

openSUSE-SU-2026:11024-1 — python311-PyJWT-2.13.0-1.1 on GA media

python311-PyJWT-2.13.0-1.1 on GA media

PYSEC-2026-179

Affected: PyPI: pyjwt

RHSA-2026:25928 — Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update

ansible-lightspeed: Ansible Lightspeed: Session hijacking and unauthorized data access due to insufficient session expiration urllib3: urllib3: Information disclosure via cross-origin redirects forwarding sensitive headers urllib3: urllib3: Denial of Service due to excessive HTTP response decompression python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens

RLSA-2026:25902 — Important: fence-agents security update

Affected: Rocky Linux:10: fence-agents

Security Fix(es):

* python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:22138-1 — Security update for python-PyJWT

Security update for python-PyJWT

UBUNTU-CVE-2026-48526

Affected: Ubuntu:Pro:16.04:LTS: pyjwt, Ubuntu:Pro:18.04:LTS: pyjwt, Ubuntu:Pro:20.04:LTS: pyjwt, Ubuntu:22.04:LTS: pyjwt, Ubuntu:24.04:LTS: pyjwt, Ubuntu:25.10: pyjwt, Ubuntu:26.04:LTS: pyjwt

WID-SEC-W-2026-1923 — Red Hat Ansible Automation Platform: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Ansible Automation Platform ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Informationen offenzulegen, Daten zu manipulieren und einen Denial-of-Service-Zustand herbeizuführen.