SCA: security update for jwcrypto (GHSA-fjrm-76x2-c4q4)

medium Tenable Self-Hosted Container Security Plugin ID 442727

Description

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

- 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 the decompressed
output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A
token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in
1.5.7. (CVE-2026-39373)

Solution

Update the jwcrypto library and its related packages to version 1.5.7 or later.

Plugin Details

Severity: Medium

ID: 442727

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 6/6/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-39373

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/8/2026

Vulnerability Publication Date: 4/7/2026

Reference Information

CVE: CVE-2026-39373

cwe: CWE-409

Detections

Analytics