Is CVE-2026-112880 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112880 being exploited in the wild.

How severe is CVE-2026-112880?

Informational severity, published 26 October 2026.

Which products and versions are affected?

Benoitc Hackney 2.0.0 before 4.9.0.

Is there a fix for CVE-2026-112880?

Yes: fixed in hackney 4.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-112880 attacked?

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

Am I affected by CVE-2026-112880?

Check whether you run Benoitc Hackney 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-2026-112880: hackney HTTP request/response splitting in proxy authentication

CVE-2026-112880 · Severity: info · Published 2026-10-26

hackney is an HTTP client library used in Erlang/Elixir applications. An attacker who controls the headers in a 407 proxy authentication response can inject carriage return and line feed characters into the Proxy-Authorization header, allowing them to inject additional HTTP headers or split the request. This could enable attackers to bypass authentication checks or manipulate requests sent through HTTP proxies.

Technologies: Benoitc Hackney. Vendors: Benoitc.

Quick answers

Is CVE-2026-112880 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112880 being exploited in the wild.
How severe is CVE-2026-112880?: Informational severity, published 26 October 2026.
Which products and versions are affected?: Benoitc Hackney 2.0.0 before 4.9.0.
Is there a fix for CVE-2026-112880?: Yes: fixed in hackney 4.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-112880 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-112880?: Check whether you run Benoitc Hackney 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.

How to fix

Fixed in: hackney 4.9.0

Technical details

The vulnerability is an improper neutralization of CRLF sequences (HTTP request/response splitting) in the hackney_http_connect module's handle_proxy_auth/11 function. When a 407 response is received from an HTTP CONNECT proxy, the library invokes a caller-supplied proxy_auth_fun callback with the response headers; if the callback returns a binary containing CR, LF, or NUL bytes, these are written directly into the Proxy-Authorization header without validation, allowing header injection. The attacker must control data that influences the callback's return value, such as proxy challenge headers.

Affected products

benoitc hackney 2.0.0 before 4.9.0

Timeline

2026-10-26: disclosed

References

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