---
cve: "CVE-2026-82729"
severity: "MEDIUM"
cvss: 6.3
epss: "0.5%"
vendor: "elixir-mint"
kev: false
exploited: false
published: "2026-09-04 15:17:36"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T08:06:49+02:00"
---

# CVE-2026-82729

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 75c8be1fada9983d6972418d162d55b6e62d507e (Commit)
- bd2a4e7513594997c140cfef9fe0e968712fb588 (Commit)

## Referenzen

- <https://github.com/elixir-mint/mint/security/advisories/GHSA-7p8w-j234-7qc8>
- <https://cna.erlef.org/cves/CVE-2026-82729.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-82729>
- <https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-82729) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_