Skip to content
CVE PROGRAM SOURCE RECORD2.1 Low

CVE-2026-112880

CRLF injection in Proxy-Authorization header built from proxy_auth_fun in hackney

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
EEF

Description

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in hackney_http_connect in benoitc hackney allows HTTP Request Splitting via the value a proxy_auth_fun callback returns. After a 407 response from an HTTP CONNECT proxy, hackney_http_connect:handle_proxy_auth/11 calls the caller's proxy_auth_fun with the status code and the response headers and writes the returned binary into the Proxy-Authorization line of the CONNECT retry without checking it. A CR, LF or NUL byte in that value adds header lines to the request sent to the proxy. The value is attacker-influenced when the callback derives it from untrusted data, for example from the proxy's challenge headers. Other caller-supplied values on the CONNECT path, such as the target host and the request headers, were already checked for control bytes. This issue affects hackney: from 2.0.0 before 4.9.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

benoitc hackney

Default version status: unaffected

  • 2.0.0 to < 4.9.0affected
pkg:hex/hackney

benoitc hackney

Default version status: unaffected

  • 5df5a74a2817d5b12880d217db33253ff1fae1b5 to < 5ee7d7d19eba27e774667d472feb1e93a08af7f9affected
pkg:github/benoitc/hackney

References