CVE-2026-8924 trailing dot domain super cookie
A malicious server can set super cookies bypassing Public Suffix List checks, causing curl to transmit sensitive cookies to unrelated domains.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8924?
CVE-2026-8924 is a critical vulnerability in Haxx Curl, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-201
Which versions are affected by CVE-2026-8924?
It affects 1 product.
Linux distribution packages (1)
libpsl openSUSE:Tumbleweed | All versions | 0.23.0-1.1 |
Products include Haxx Curl.
How do I fix CVE-2026-8924?
Upgrade to a fixed version.
Is CVE-2026-8924 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8924 exists.
Other vulnerabilities in Haxx Curl
Sources
Also known as ALPINE-CVE-2026-8924, AZL-91845, BELL-CVE-2026-8924, CURL-CVE-2026-8924, DEBIAN-CVE-2026-8924, ECHO-4b8f-d51c-29b8 and 12 more.