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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-6276

stale custom cookie host causes cookie leak

Description

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.

Affected products

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

curl curl

Default version status: unaffected

  • 7.71.0 to < 8.14.2affected
  • 8.15.0 to < 8.16.1affected
  • 8.17.0 to < 8.20.0affected

curl curl

Default version status: unaffected

  • e15e51384a423be31318b3c9c7d612a1aae661fd to < 3a19987a87f393d9394fe5acc7643f6c263c92dbaffected

curl curl

Default version status: unaffected

  • 8.19.0affected
  • 8.18.0affected
  • 8.17.0affected
  • 8.16.0affected
  • 8.15.0affected
  • 8.14.1affected
  • 8.14.0affected
  • 8.13.0affected
  • 8.12.1affected
  • 8.12.0affected
  • 8.11.1affected
  • 8.11.0affected
  • 8.10.1affected
  • 8.10.0affected
  • 8.9.1affected
  • 8.9.0affected
  • 8.8.0affected
  • 8.7.1affected
  • 8.7.0affected
  • 8.6.0affected
  • 8.5.0affected
  • 8.4.0affected
  • 8.3.0affected
  • 8.2.1affected
  • 8.2.0affected
  • 8.1.2affected
  • 8.1.1affected
  • 8.1.0affected
  • 8.0.1affected
  • 8.0.0affected
  • 7.88.1affected
  • 7.88.0affected
  • 7.87.0affected
  • 7.86.0affected
  • 7.85.0affected
  • 7.84.0affected
  • 7.83.1affected
  • 7.83.0affected
  • 7.82.0affected
  • 7.81.0affected
  • 7.80.0affected
  • 7.79.1affected
  • 7.79.0affected
  • 7.78.0affected
  • 7.77.0affected
  • 7.76.1affected
  • 7.76.0affected
  • 7.75.0affected
  • 7.74.0affected
  • 7.73.0affected
  • 7.72.0affected
  • 7.71.1affected
  • 7.71.0affected

References