CVE-2026-58229
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
A vulnerability in the Mint library for Elixir allows a remote HTTP server to exhaust client memory and cause a denial of service (DoS). The HTTP header decoding functions accumulate headers without limits, and the parser has no cap on the number or size of headers, enabling an attacker to stream infinite header lines without a terminating blank line.
Risk Assessment
A malicious HTTP server (directly, via redirect, SSRF, or man-in-the-middle) can exhaust the BEAM process memory, crashing the entire application using Mint as an HTTP client.
Recommendation
Immediately upgrade the mint library to version 1.9.2 or later, which includes a fix limiting the number and size of headers.
Other vulnerabilities in mint
See all- CVE-2026-59249Medium
A vulnerability in the Mint library (versions 0.1.0 through 1.9.2) allows HTTP response smuggling by accepting a plus/minus sign in the chunk-size line of Transfer-Encoding: chunked. A malicious HTTP/1 server can exploit this interpretation mismatch to poison the response queue on a shared keep-alive connection, causing subsequent requests to receive forged responses.
- CVE-2026-59246Medium
A vulnerability in the Mint library for Elixir allows a remote HTTP/2 server to exhaust client memory by sending an infinite stream of zero-length CONTINUATION frames. The header accumulation mechanism lacks proper protection against this attack, leading to denial of service (DoS).
- CVE-2026-56810High
A vulnerability in the Mint library (Mint.HTTP1 module) allows a remote server to exhaust client memory by sending a chunked transfer-encoded response with a declared huge chunk size (e.g., 2 GiB) and slowly sending data without ever completing the chunk. The client buffers all received bytes without emitting them to the caller, leading to uncontrolled memory growth and out-of-memory conditions.
- CVE-2026-49754High
A vulnerability in the Mint library for Elixir allows an attacker-controlled HTTP/2 server to exhaust client memory via a CONTINUATION frame flood. There is no limit on the header accumulator size, leading to memory exhaustion and BEAM process death.
- CVE-2026-49753Medium
Elixir Mint library before version 1.9.0 is vulnerable to HTTP response smuggling. The Content-Length parser accepts + and - signs, violating RFC 7230. An attacker-controlled HTTP/1 server can desynchronize response framing on shared connections.
- CVE-2026-48862High
A vulnerability in the Mint library for Elixir allows an attacker-controlled HTTP/2 server to exhaust client memory via PUSH_PROMISE flooding. The server can create an unlimited number of stream entries without checking the max_concurrent_streams limit, leading to memory exhaustion.
- CVE-2026-48861Low
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in elixir-mint Mint allows HTTP Request Splitting and HTTP Request Smuggling. In lib/mint/http1/request.ex, the encode_request_line/2 function splices the caller-supplied method and target arguments directly into the HTTP/1 request line without any character validation. An application that forwards attacker-controlled input as the HTTP method or target to Mint.HTTP.request/5 is therefore exposed to request-line CRLF injection. Mint 1.7.0 introduced validate_request_target/2, which rejects CRLF and other control characters in the target by default, but the method field remains unvalidated.
Original NVD description (English source)
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.