PyJWT: PyJWK accepts empty HMAC keys, bypassing PyJWT's empty-key validation

Summary A service that verifies HS256 tokens using an empty oct JWK through PyJWK, including a PyJWK obtained from PyJWKSet, can therefore accept attacker-generated tokens as authenticated. PyJWT 2.13.0 rejects an empty HMAC key when it is supplied through the raw str/bytes key path, but accepts...

CVE-2026-97055

SigNoz from v0.8.0 before v0.143.0 defaults the JWT tokenizer signing secret tokenizer::jwt::secret, set via SIGNOZTOKENIZERJWTSECRET or the deprecated SIGNOZJWTSECRET to an empty string, and Config.Validate does not reject the empty value, so a deployment that does not configure a secret starts ...

CVE-2026-97055

SigNoz versions v0.8.0 before v0.143.0 are vulnerable to an authentication bypass because the JWT tokenizer signing secret defaults to an empty string. Since Config.Validate() fails to reject empty values, deployments without a configured secret sign and verify session tokens with an empty HMAC k...

EUVD-2026-85774

SigNoz from v0.8.0 before v0.143.0 defaults the JWT tokenizer signing secret tokenizer::jwt::secret, set via SIGNOZTOKENIZERJWTSECRET or the deprecated SIGNOZJWTSECRET to an empty string, and Config.Validate does not reject the empty value, so a deployment that does not configure a secret starts ...

CVE-2026-75870

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie...

CVE-2026-75870 Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie...

CVE-2026-75870 Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie...

EUVD-2026-64294

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie...

CVE-2026-75870

Punk versions before 0.18 for Perl are vulnerable to session cookie forgery due to the use of an empty default HMAC key . When a session is declared without a secret, the application fails to warn or refuse to start, defaulting to a zero-length HMAC-SHA256 key for signing and verification. An att...

PT-2026-79556

Name of the Vulnerable Software and Affected Versions Punk versions prior to 0.18 Description Punk for Perl allows session cookie forgery when a session is declared without a secret. The session keyword does not require a secret or issue a warning when one is absent, causing the cookie read and...

CVE-2026-75870: Use of Default Cryptographic Key

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie...

CVE-2026-11366

The MonsterInsights WordPress plugin (versions before 11.1.0 ) is vulnerable to an unauthenticated signature validation bypass. When the plugin is not connected to Google Analytics, the HMAC signing key is empty, allowing attackers to forge a valid signature. This enables unauthenticated actors t...

CVE-2026-11366 MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Key HMAC Bypass

The MonsterInsights WordPress plugin before 11.1.0 does not correctly validate the signature on one of its unauthenticated AJAX actions: when the MonsterInsights WordPress plugin before 11.1.0 is not connected to Google Analytics the HMAC signing key is empty, which lets unauthenticated attackers...

CVE-2026-11366 MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Key HMAC Bypass

The MonsterInsights WordPress plugin before 11.1.0 does not correctly validate the signature on one of its unauthenticated AJAX actions: when the MonsterInsights WordPress plugin before 11.1.0 is not connected to Google Analytics the HMAC signing key is empty, which lets unauthenticated attackers...

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...

OPENSUSE-SU-2026:21263-1 Security update for python-joserfc

This update for python-joserfc fixes the following issues: Changes in python-joserfc: - CVE-2026-49852: HS256/HS384/HS512 verify accepts empty/nil HMAC key bsc1270234...