elixir-mint 1.9.0/1.9.1 HTTP1 lib/mint/http1.ex decode_headers chunked-trailer allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in elixir-mint mint. The affected element is the function decode_headers of the file lib/mint/http1.ex of the component HTTP1 Handler. Executing a manipulation of the argument chunked-trailer can lead to allocation of resources. The identification of this vulnerability is CVE-2026-58229. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in elixir-mint mint and classified as problematic. This vulnerability affects the function decode_headers of the file lib/mint/http1.ex of the component HTTP1 Handler. The manipulation of the argument chunked-trailer with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP1.decode_headers/5 and Mint.HTTP1.decode_trailer_headers/4 functions in lib/mint/http1.ex accumulate every parsed response header and chunked-trailer field into a per-request list that persists across incoming TCP segments as request.headers_buffer, and only clear it when the terminating blank line is received. The section has no cap on the number of headers or on total bytes, and the underlying :erlang.decode_packet(:httph_bin, binary, []) parser is invoked with an empty option list so its per-line and per-packet size limits also default to unlimited. A malicious HTTP server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can stream complete header lines (or, after a chunked body, complete trailer lines) indefinitely without ever emitting the terminating blank line. The connection state grows without bound until the BEAM node is killed by the operating system's out-of-memory handler, taking down the entire application that uses Mint as an HTTP client. This issue affects mint: from 0.1.0 before 1.9.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-58229 since 06/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.9.2 eliminates this vulnerability.

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Productinfo

Vendor

• elixir-mint

Name

• mint

Version

• 1.9.0
• 1.9.1

Website

• Product: https://github.com/elixir-mint/mint/

CPE 2.3info

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CPE 2.2info

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