GHSA-5739-39v2-5754: web-token/jwt-library

PHP JWT Library: RSA1_5 (RSAES-PKCS1-v1_5) decryption lacks implicit rejection, exposing a Bleichenbacher/Marvin padding oracle

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 18 Jun 2026, 21:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
web-token/jwt-library	Packagist	<3.4.10 \|\| >=4.0.0, <4.0.7 \|\| >=4.1.0, <4.1.7	3.4.10, 4.0.7, 4.1.7

Identifiers

GHSA-5739-39v2-5754

Weakness (CWE)

CWE-208 · CWE-385

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
Not published	None	4.0	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

This record came from the full history of the GitHub Advisory Database, published 18 Jun 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.