Pending AnalysisCVE-2026-6276

stale custom cookie host causes cookie leak

Platform

c

Component

curl

Fixed in

8.19.1

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Threat Intelligence

Exploit Status

Proof of ConceptUnknown
CISA KEVNO

EPSS

0.01% (1% percentile)

Affected Software

Componentcurl
Vendorcurl
Minimum version8.12.0
Maximum version8.19.0
Fixed in8.19.1

Weakness Classification (CWE)

Timeline

  1. Reserved
  2. Published
  3. EPSS updated

How to fix

Actualice a la versión 8.19.1 o posterior de libcurl para evitar la fuga de cookies. Esta vulnerabilidad ocurre cuando se utiliza un encabezado 'Host' personalizado y se realiza una segunda solicitud sin él, lo que puede llevar a que se utilicen cookies incorrectas.

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