Critical severity · published Jul 3, 2026
CVE-2026-8924
trailing dot domain super cookie
9.1
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
7.46.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.20.1; e77b5b7453c1e8ccd7ec0816890d98e2f392e465 before 51beed175dbfc37da3113f6acce60c630c070ce8; 8.20.0; 8.19.0; +34 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8924
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8924
Patch
https://curl.se/docs/CVE-2026-8924.html
Vendor Advisory
https://curl.se/docs/CVE-2026-8924.json
Exploit
https://hackerone.com/reports/3733905
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