CVE-2026-42585

6.5 MEDIUM 0.3% exploit odds Fix listed Other

What it is

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-05-13 19:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-26 17:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-05-13 19:17 UTC
Last modified: 2026-10-26 17:10 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-444
Record status: Analyzed

Affected

Netty < 4.1.133
Netty < 4.2.13

Attack profile CVSS 3.1 · 6.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Download Square Reddit

Fix and advisories

References

NVD record · CVE.org record