CVE-2026-8924 Affecting curl package, versions <8.21.0~rc2-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

Social Trends
EPSS
0.65% (47th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-CURL-17440221
  • published24 Jun 2026
  • disclosed3 Jul 2026

Introduced: 24 Jun 2026

NewCVE-2026-8924  (opens in a new tab)

How to fix?

Upgrade Debian:unstable curl to version 8.21.0~rc2-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

CVSS Base Scores

version 3.1