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CVE-2026-8924

39
FAUCET Score

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.

First published: Jul 3, 2026Last modified: Jul 3, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.46.0, < 8.21.0CPE matchmatch criteria
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
>= 7.46.0, <= 7.46.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.47.0, <= 7.47.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.47.1, <= 7.47.1CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.48.0, <= 7.48.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 23rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

ubuntupatch availablevia ubuntu_usn
Product: curl (bionic)Fixed in: 7.58.0-2ubuntu3.24+esm9
ubuntupatch availablevia ubuntu_usn
Product: curl (focal)Fixed in: 7.68.0-1ubuntu2.25+esm4
ubuntupatch availablevia ubuntu_usn
Product: curl (jammy)Fixed in: 7.81.0-1ubuntu1.25
ubuntupatch availablevia ubuntu_usn
Product: curl (noble)Fixed in: 8.5.0-2ubuntu10.10
ubuntupatch availablevia ubuntu_usn
Product: curl (questing)Fixed in: 8.14.1-2ubuntu1.4
ubuntupatch availablevia ubuntu_usn
Product: curl (resolute)Fixed in: 8.18.0-1ubuntu2.2
ubuntupatch availablevia ubuntu_usn
Product: curl (trusty)Fixed in: 7.35.0-1ubuntu2.20+esm20
ubuntupatch availablevia ubuntu_usn
Product: curl (xenial)Fixed in: 7.47.0-1ubuntu2.19+esm16

Vendor Advisories (2)

microsoft2026-Jul/CVE-2026-8924Important

trailing dot domain super cookie

Jul 2, 2026
ubuntuUSN-8487-1

curl vulnerabilities

Jun 30, 2026

References

curl.se / docs/CVE-2026-8924.html
PatchVendor Advisory
curl.se / docs/CVE-2026-8924.json
Vendor Advisory
hackerone.com / reports/3733905
ExploitIssue TrackingThird Party Advisory