CVE-2026-8924CWE-201

CVE-2026-8924

Critical · published July 3, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
51.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00661 · 51.0th percentile
Weakness
CWE-201 · Insertion of Sensitive Information Into Sent Data
Published
2026-07-03T11:16Z
Affected products (1)
ProductVersionsFixed in
haxx/curl≥ 7.46.0, < 8.21.08.21.0
References (4)
https://curl.se/docs/CVE-2026-8924.html · 2499f714-1537-4658-8207-48ae4bb9eae9https://curl.se/docs/CVE-2026-8924.json · 2499f714-1537-4658-8207-48ae4bb9eae9https://hackerone.com/reports/3733905 · 2499f714-1537-4658-8207-48ae4bb9eae9https://hackerone.com/reports/3733905 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 JUL 06:15Z
    trailing dot domain super cookie
    cvelistv5