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.max_payload_length, which can lead to resource exhaustion. The normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to reject oversized token content during verification have a moderate availability risk. This issue has been fixed in version 1.6.7.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.max_payload_length, which can lead to resource exhaustion. The
    normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with
    ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false
    compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than
    JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to
    reject oversized token content during verification have a moderate availability risk. This issue has been
    fixed in version 1.6.7. (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, joserfc accepts oversized RFC7797 b64=false JWS     payloads without applying JWSRegistry.max_payload_length, which can lead to resource exhaustion. The     normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with     ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false     compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than     JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to     reject oversized token content during verification have a moderate availability risk. This issue has been     fixed in version 1.6.7. (CVE-2026-48990)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
444071	SCA: security update for joserfc (GHSA-wphv-vfrh-23q5)	Tenable Cloud Security	SCA Checks	medium
444071	SCA: security update for joserfc (GHSA-wphv-vfrh-23q5)	Tenable Self-Hosted Container Security	SCA Checks	medium
321657	Linux Distros Unpatched Vulnerability : CVE-2026-48990	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-48990

medium

Tenable Plugins

medium

medium

medium