Vulnerability Description
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint Mint allows attacker-controlled HTTP/1 servers to desynchronise response framing on shared connections. Mint's HTTP/1 Content-Length parser, Mint.HTTP1.Parse.content_length_header/1 in lib/mint/http1/parse.ex, parses the header value with Integer.parse/1, which accepts an optional + or - sign prefix. The length >= 0 guard rejects negatives, but inputs such as +0 or +123 are returned as valid lengths. RFC 7230 specifies Content-Length = 1*DIGIT, with no sign character permitted. A fronting proxy or load balancer that strictly enforces the grammar will reject or reframe a header like Content-Length: +0, while Mint silently treats it as zero. When Mint reuses the socket (keep-alive, pipelining, or any pooled connection shared across requesters), the parser disagreement is a response-smuggling primitive: the proxy delimits the body one way, Mint another, and bytes from one response get attributed to the next. Where the same Mint connection is shared across trust boundaries, an attacker-controlled upstream can leak bytes into a different consumer's response stream. This issue affects mint: from 0.1.0 before 1.9.0.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-49753.html
- https://github.com/elixir-mint/mint/commit/47e48027480228e4e32a0b4df39db497b4804
- https://github.com/elixir-mint/mint/security/advisories/GHSA-mjqx-c6f6-7rc2
- https://osv.dev/vulnerability/EEF-CVE-2026-49753
- https://github.com/elixir-mint/mint/security/advisories/GHSA-mjqx-c6f6-7rc2
FAQ
What is CVE-2026-49753?
CVE-2026-49753 is a documented vulnerability. Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in elixir-mint Mint allows attacker-controlled HTTP/1 servers to desynchronise response framing on shared...
How severe is CVE-2026-49753?
CVSS scoring is not yet available for CVE-2026-49753. Check NVD for updates.
Is there a patch for CVE-2026-49753?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.