{"cve":"CVE-2026-33870","nvd":{"published":"2026-03-27T20:16:34.663","modified":"2026-09-14T13:18:17.593","status":"Modified","description":"Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.","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:H/A:N","score":7.5},"cwes":["CWE-444"],"references":["https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8","https://w4ke.info/2025/06/18/funky-chunks.html","https://w4ke.info/2025/10/29/funky-chunks-2.html","https://www.rfc-editor.org/rfc/rfc9110","https://access.redhat.com/errata/RHSA-2026:10175"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-33870","score":0.00701,"percentile":0.53232,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pwqr-wmgm-9rr8","url":"https://osv.dev/vulnerability/GHSA-pwqr-wmgm-9rr8","summary":"Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing","modified":"2026-09-10T03:50:40.493461444Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","ranges":["<4.1.132.Final"],"fixed":["4.1.132.Final"]},{"ecosystem":"Maven","name":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","ranges":[">=4.2.0.Alpha1 <4.2.10.Final"],"fixed":["4.2.10.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."]}