CVE-2026-33204 identifies an unauthenticated Denial of Service vulnerability in the SimpleJWT PHP library, affecting versions prior to 1.1.1 when PBES2 algorithms are employed. Rated High with a CVSS score of 7.5, this flaw allows a remote attacker to achieve a denial of service by tampering with JWE headers, requiring no authentication or user interaction. The attack vector is network-based with low complexity, impacting system availability. Currently, there is no evidence of active exploitation, public exploit code, or significant media coverage, though it has received minimal community discussion. Organizations using SimpleJWT should upgrade to version 1.1.1 or later to mitigate this risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.1.1CPE matchmatch criteria | cpe:2.3:a:kelvinmo:simplejwt:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.