PT-2026-45786 · Mint · Mint

Eric Meadows-Jönsson

+1

·

Published

2026-06-02

·

Updated

2026-06-02

·

CVE-2026-49753

CVSS v4.0

6.3

Medium

VectorAV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Name of the Vulnerable Software and Affected Versions mint versions 0.1.0 through 1.8.x
Description An inconsistent interpretation of HTTP requests, known as HTTP Request/Response Smuggling, allows attacker-controlled HTTP/1 servers to desynchronize response framing on shared connections. The issue occurs because the HTTP/1 Content-Length parser, specifically the content length header/1 function in lib/mint/http1/parse.ex, uses Integer.parse/1 to process header values. This allows optional plus (+) or minus (-) sign prefixes; while negative values are rejected, inputs like +0 or +123 are accepted as valid lengths, contradicting RFC 7230 which permits only digits. A fronting proxy or load balancer enforcing strict grammar may reject or reframe such headers while Mint treats them as valid. When sockets are reused via keep-alive, pipelining, or pooled connections shared across requesters, this disagreement allows bytes from one response to be attributed to the next, potentially leaking data into a different consumer's response stream if the connection is shared across trust boundaries.
Recommendations Update to version 1.9.0 or later.

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

CVE-2026-49753
GHSA-MJQX-C6F6-7RC2

Affected Products

Mint