Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.
parse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.
This issue affects mint: from 1.9.3 before 1.10.0.
CVSS
No CVSS.
References
Configurations
No configuration.
History
No history.
Information
Published : 2026-09-04 15:17
Updated : 2026-09-08 14:16
NVD link : CVE-2026-82729
Mitre link : CVE-2026-82729
CVE.ORG link : CVE-2026-82729
JSON object : View
Products Affected
No product.
CWE
CWE-407
Inefficient Algorithmic Complexity