CVE-2026-82729

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Source
https://cve.org/CVERecord?id=CVE-2026-82729
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82729.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-82729
Aliases
Published
2026-09-04T14:31:20Z
Modified
2026-09-10T03:30:33Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Quadratic chunk-size parsing in Mint.HTTP1.Parse allows CPU-exhaustion DoS
Details

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.

Database specific 
{
    "cna_assigner":  "EEF",
    "cwe_ids":  [
        "CWE-407"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82729.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "fc7d16538db7e40b56ed489f08683225cb0197fa"
                },
                {
                    "fixed":  "bd2a4e7513594997c140cfef9fe0e968712fb588"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/elixir-mint/mint

Affected ranges

Type
GIT
Repo
https://github.com/elixir-mint/mint
Events
Introduced
f0b72c0b2363c98d0a220019d108ac6141715428
Fixed
75c8be1fada9983d6972418d162d55b6e62d507e
Fixed
bd2a4e7513594997c140cfef9fe0e968712fb588
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "1.9.3"
        },
        {
            "fixed":  "1.10.0"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.9.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82729.json"