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CVE-2026-82672 - Unvalidated chunk-size line tail in Mint HTTP/1 client enables response smuggling against strict intermediaries on pooled connections

CVE ID : CVE-2026-82672 Published : Sept. 19, 2026, 5:16 p. m. • 3 hours, 40 minutes ago Description : Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint mint allows a malicious HTTP/1 server to desynchronize a strict intermediary and the Mint client on a pooled connection, enabling response-queue poisoning against subsequent requests that share the connection. Mint. HTTP1. Parse. chunk_size/1 in lib/mint/http1/parse. ex stops at the first non-hexadecimal byte of a chunked response's chunk-size line and returns the remainder unexamined. Mint. HTTP1. decode_body/5 in lib/mint/http1. ex then discards every byte up to the CRLF with Parse. ignore_until_crlf/1, so the accepted grammar is a run of hex digits followed by arbitrary bytes, where RFC 9112 permits only a ;-introduced chunk extension.