CVE-2026-8924

critical · 9.1

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.

9.1

CVSS

0.7%

EPSS (exploit prob.)

50th

EPSS percentile

2026-07-03

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-201

Affected products

Vendor	Product	Affected versions
haxx	curl	>= 7.46.0, < 8.21.0

Check a specific version with /api/v1/cve/match.

References

https://curl.se/docs/CVE-2026-8924.html
https://curl.se/docs/CVE-2026-8924.json
https://hackerone.com/reports/3733905
https://hackerone.com/reports/3733905

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-8924