---
cve: "CVE-2026-59246"
severity: "MEDIUM"
cvss: 6.3
epss: "0.5%"
vendor: "elixir-mint"
kev: false
exploited: false
published: "2026-07-14 08:37:04"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T20:28:02+02:00"
---

# CVE-2026-59246

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service.

The Mint.HTTP2.handle_continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting, one level deeper per frame, and only releases it when a frame with the END_HEADERS flag arrives. The only guard on this accumulator is Mint.HTTP2.assert_header_block_within_max_size/2, which sums the byte size of the fragments received so far. Because a CONTINUATION frame is permitted by the protocol to carry a zero-length payload, an unbounded chain of zero-length CONTINUATION frames adds no bytes to the running total, never trips the size cap, and never emits END_HEADERS, yet each frame still nests the accumulator one level deeper.

A malicious HTTP/2 server (reachable directly, via an attacker-controlled redirect, via SSRF, or via a man-in-the-middle) can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely. Client memory grows one cons cell per frame received; sustained bandwidth from the peer drives the BEAM node running the Mint client to memory exhaustion and eventual out-of-memory termination.

This issue affects mint: from 0.1.0 before 1.9.2.

## 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)

- d066c6685dca58fceb2e22e97a9266866b622bfc (Commit)
- 5779de1666344b32aefc4354184ea07f902f73ce (Commit)

## Referenzen

- <https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9>
- <https://cna.erlef.org/cves/CVE-2026-59246.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-59246>
- <https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-59246) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_