Curl Cookie Parsing Vulnerability: Super Cookies Bypass PSL
CVE-2026-8924 Published on July 3, 2026

trailing dot domain super cookie
A flaw in curls 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.

NVD

Vulnerability Analysis

CVE-2026-8924 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. An automatable proof of concept (POC) exploit exists. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Products Associated with CVE-2026-8924

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Canonical Ubuntu Linux
 
Haxx Curl
 

Affected Versions

curl: