PYSEC-2026-1203 Authlib is vulnerable to Denial of Service via Oversized JOSE Segments

Summary Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving...

PYSEC-2026-287 Authlib JWS JWK Header Injection: Signature Verification Bypass

Description Summary A JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic...

Resource Exhaustion

joserfc is vulnerable to Resource Exhaustion. The vulnerability is due to missing payload size validation for RFC7797 b64=false JWS payloads, where oversized payloads bypass the configured maximum payload length check, and attackers can exploit it by submitting large JWS tokens that consume...

PHP JWT Framework: JWSVerifier uses algorithm from unprotected header, enabling algorithm confusion attacks

Summary JWSVerifier::getAlgorithm in src/Library/Signature/JWSVerifier.php line 144 merges protected and unprotected headers using PHP's spread operator: php $completeHeader = ...$signature-getProtectedHeader, ...$signature-getHeader; In PHP, when spreading arrays with duplicate string keys, the...

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,...

PT-2026-50551

Name of the Vulnerable Software and Affected Versions joserfc versions 1.3.4 through 1.6.5 Description joserfc is a Python library implementing JSON Object Signing and Encryption JOSE standards. The library fails to apply the JWSRegistry.max payload length limit when processing RFC7797 b64=false...

JWSVerifier uses algorithm from unprotected header, enabling algorithm confusion attacks

Summary JWSVerifier::getAlgorithm in src/Library/Signature/JWSVerifier.php line 144 merges protected and unprotected headers using PHP's spread operator: php $completeHeader = ...$signature-getProtectedHeader, ...$signature-getHeader; In PHP, when spreading arrays with duplicate string keys, the...

CVE-2026-48525

A flaw was found in PyJWT. A remote attacker can exploit this by supplying an arbitrarily large Base64URL payload segment when verifying detached JSON Web Signature JWS tokens using the unencoded-payload option. This forces excessive CPU work and memory allocations, leading to a Denial of Service...

pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

A missing verification step has been discovered in PyJWT. PyJWT does not validate the crit Critical Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This...

JWCrypto: python-cryptography: python: JWCrypto: Memory exhaustion via crafted compressed JWE tokens

A flaw was found in JWCrypto, a Python library for JSON Web Key JWK, JSON Web Signature JWS, and JSON Web Encryption JWE specifications. An unauthenticated attacker can exploit this vulnerability by sending specially crafted JWE tokens that use ZIP compression. While the input token size is...

CVE-2026-45091 sealed-env: TOTP secret embedded in unseal token payload (enterprise mode)

sealed-env is a cross-stack, zero-trust secret management library for Node.js and Java/Spring Boot. In sealed-env enterprise mode, versions 0.1.0-alpha.1 through 0.1.0-alpha.3 embedded the operator's literal TOTP secret in the JWS payload of every minted unseal token. JWS payload is base64-encode...

CVE-2026-45091

CVE-2026-45091 affects sealed-env in enterprise mode prior to 0.1.0-alpha.4. In versions 0.1.0-alpha.1 to alpha.3, the operator’s literal TOTP secret was embedded in the JWS payload of every minted unseal token. The JWS payload is base64-encoded JSON, not encrypted, allowing anyone who can observ...

pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

A missing verification step has been discovered in PyJWT. PyJWT does not validate the crit Critical Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This...

CLEANSTART-2026-FK30234 Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web To...

Multiple security vulnerabilities affect the tekton-pipelines-fips package. Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption JWE, JSON Web Signature JWS, and JSON Web Token JWT standards. See...

OESA-2026-1926 python-jwcrypto security update

Implements JWK, JWS, JWE specifications with python-cryptography Security Fixes: JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing...

OESA-2026-1924 python-jwcrypto security update

Implements JWK, JWS, JWE specifications with python-cryptography Security Fixes: JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing...

OESA-2026-1923 python-jwcrypto security update

Implements JWK, JWS, JWE specifications with python-cryptography Security Fixes: JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing...

CLEANSTART-2026-TN07413 Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web To...

Multiple security vulnerabilities affect the terragrunt-fips package. Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption JWE, JSON Web Signature JWS, and JSON Web Token JWT standards. See references...

Security Bulletin: Signature Verification Bypass Vulnerability in auth0/node-jws (HS256, ≤ v3.2.2 & v4.0.0) affects watsonx.data

Summary A vulnerability in auth0/node-jws allows attackers to bypass signature verification when using the HS256 algorithm under certain conditions. The issue occurs when applications rely on user-controlled data for HMAC secret lookup during verification. This can affect watsonx.data...

PYSEC-2026-70

JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102 limits input token size to 250KB but does not validate th...