Is CVE-2026-82672 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-82672 being exploited in the wild.

How severe is CVE-2026-82672?

Informational severity, published 19 September 2026.

Which products and versions are affected?

Elixir-Mint Mint 0.1.0 before 1.10.1.

Is there a fix for CVE-2026-82672?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-82672 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-82672?

Check whether you run Elixir-Mint Mint at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-82672: Elixir Mint HTTP request smuggling in chunked transfer encoding

CVE-2026-82672 · Severity: info · Published 2026-09-19

Mint is an HTTP client library for Elixir applications. A malicious HTTP server can exploit inconsistent parsing of chunked responses to desynchronize with intermediaries (proxies, gateways), causing the Mint client to process attacker-controlled data intended for a different request on a reused connection. This enables response poisoning and potential session hijacking in applications that reuse connections.

Technologies: Elixir-Mint Mint. Vendors: Elixir-Mint.

Quick answers

Is CVE-2026-82672 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-82672 being exploited in the wild.
How severe is CVE-2026-82672?: Informational severity, published 19 September 2026.
Which products and versions are affected?: Elixir-Mint Mint 0.1.0 before 1.10.1.
Is there a fix for CVE-2026-82672?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-82672 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-82672?: Check whether you run Elixir-Mint Mint at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability lies in Mint.HTTP1.Parse.chunk_size/1 which accepts non-compliant chunk-size lines (e.g., "5ZZZZZ" or "0ZZZZ") by stopping at the first non-hex byte and ignoring the rest until CRLF, rather than validating RFC 9112 chunk extension syntax. An RFC-compliant intermediary rejects such malformed lines while Mint accepts them, causing disagreement on message boundaries. Attack requires a malicious or compromised server and connection pooling, allowing response queue poisoning on subsequent pooled requests.

Affected products

elixir-mint Mint 0.1.0 before 1.10.1

Timeline

2026-09-19: disclosed

References

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