{"cve":"CVE-2026-42580","nvd":{"published":"2026-05-13T19:17:23.490","modified":"2026-10-26T17:10:03.270","status":"Analyzed","description":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","score":6.5},"cwes":["CWE-190","CWE-444"],"references":["https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723","https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-26T17:39:09.812804557+00:00"},"epss":{"cve":"CVE-2026-42580","score":0.00378,"percentile":0.31515,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-m4cv-j2px-7723","url":"https://osv.dev/vulnerability/GHSA-m4cv-j2px-7723","summary":"Netty vulnerable to HTTP Request Smuggling due to incorrect chunk size parsing","modified":"2026-09-10T03:51:06.379210477Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","ranges":[">=4.2.0.Alpha1 <4.2.13.Final"],"fixed":["4.2.13.Final"]},{"ecosystem":"Maven","name":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","ranges":["<4.1.133.Final"],"fixed":["4.1.133.Final"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}