python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens

A flaw was found in PyJWT, a Python library for JSON Web Token JWT implementation. When decoding JWTs, the library fails to validate the use of JSON Web Keys JWK in the HMAC algorithm while also supporting asymmetric algorithms. This allows a remote attacker to use the issuer's public key as the...

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

!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...

CVE-2026-45039 RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, getsharedsecret in crates/ecstore/src/rpc/httpauth.rs, falls back to...

CVE-2026-45039

RustFS prior to 1.0.0-beta.2 uses an HMAC-SHA256 signature for internode RPC authentication that falls back to DEFAULT_SECRET_KEY = "rustfsadmin" if neither RUSTFS_RPC_SECRET nor the global S3 secret key is configured. The vulnerability arises from get_shared_secret() in crates/ecstore/src/rpc/ht...

CVE-2026-45039 RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, getsharedsecret in crates/ecstore/src/rpc/httpauth.rs, falls back to...

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...

DEBIAN-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...

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

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...

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...

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

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...

CVE-2026-48526

PyJWT (Python) prior to 2.13.0 did not validate the use of JSON Web Keys in HMAC verification, allowing an attacker to use the issuer public key as the HMAC secret during token verification. This could enable forging tokens when mixing RS/EC/JWK and HS algorithms. The issue is fixed in PyJWT 2.13...

GHSA-7HH5-PRP2-MFH5 Cleartext storage of HMAC signing key in Amazon SageMaker Python SDK ModelBuilder/Serve path

Summary Amazon SageMaker Python SDK is an open-source library for training and deploying machine learning models on Amazon SageMaker. An issue exists where, under certain circumstances, the ModelBuilder/Serve component stores an HMAC signing key in cleartext as a container environment variable,...

CVE-2026-44351 fast-jwt: Empty HMAC secret accepted via async key resolver - JWT auth bypass

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.2.4, a critical authentication-bypass vulnerability in fast-jwt's async key-resolver flow allows any unauthenticated attacker to forge arbitrary JWTs that are accepted as authentic. When the application's key resolver returns an...

NPM: fast-jwt: JWT auth bypass due to empty HMAC secret accepted by async key resolver

NPM: fast-jwt: JWT auth bypass due to empty HMAC secret accepted by async key resolver vulnerability discovered by ? in WordPress Npm fast-jwt versions = 6.2.3...

CVE-2026-30223 OliveTin: JWT Audience Validation Bypass in Local Key and HMAC Modes

OliveTin gives access to predefined shell commands from a web interface. Prior to version 3000.11.1, when JWT authentication is configured using either "authJwtPubKeyPath" local RSA public key or "authJwtHmacSecret" HMAC secret, the configured audience value authJwtAud is not enforced during toke...

User Impersonation

Overview Affected versions of this package are vulnerable to User Impersonation in the authentication process when JWT tokens are parsed without enforcing the audience claim in certain configurations. An attacker can gain unauthorized access by presenting a validly signed JWT token with an...

PT-2026-23613

Name of the Vulnerable Software and Affected Versions OliveTin versions prior to 3000.11.1 Description OliveTin allows access to predefined shell commands from a web interface. When JWT authentication is configured using a local RSA public key authJwtPubKeyPath or an HMAC secret authJwtHmacSecret...

Security Bulletin: auth0/node-jws HS256 signature verification bypass via improper HMAC secret handling (≤3.2.2, 4.0.0)

Summary auth0/node-jws HS256 signature verification bypass due to improper HMAC secret handling versions ≤ 3.2.2 and 4.0.0 Vulnerability Details CVEID:CVE-2025-65945 DESCRIPTION: auth0/node-jws is a JSON Web Signature implementation for Node.js. In versions 3.2.2 and earlier and version 4.0.0,...

GHSA-RJRP-M2JW-PV9C SageMaker Python SDK has Exposed HMAC

Summary SageMaker Python SDK is an open source library for training and deploying machine learning models on Amazon SageMaker. An issue where the HMAC secret key is stored in environment variables and disclosed via the DescribeTrainingJob API has been identified. Impact - Function and Payload...

SageMaker Python SDK has Exposed HMAC

Summary SageMaker Python SDK is an open source library for training and deploying machine learning models on Amazon SageMaker. An issue where the HMAC secret key is stored in environment variables and disclosed via the DescribeTrainingJob API has been identified. Impact - Function and Payload...