CVE-2026-8924

trailing dot domain super cookie

Published Jul 3, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

curl

unaffected

Version	Status	Constraints
`7.46.0`	affected	< 8.14.2
`8.15.0`	affected	< 8.16.1
`8.17.0`	affected	< 8.20.1

curl

unaffected

Version	Status	Constraints
`e77b5b7453c1e8ccd7ec0816890d98e2f392e465`	affected	< 51beed175dbfc37da3113f6acce60c630c070ce8

curl

unaffected

Version	Status	Constraints
`8.20.0`	affected	—
`8.19.0`	affected	—
`8.18.0`	affected	—
`8.17.0`	affected	—
`8.16.0`	affected	—
`8.15.0`	affected	—
`8.14.1`	affected	—
`8.14.0`	affected	—
`8.13.0`	affected	—
`8.12.1`	affected	—
`8.12.0`	affected	—
`8.11.1`	affected	—
`8.11.0`	affected	—
`8.10.1`	affected	—
`8.10.0`	affected	—
`8.9.1`	affected	—
`8.9.0`	affected	—
`8.8.0`	affected	—
`8.7.1`	affected	—
`8.7.0`	affected	—
`8.6.0`	affected	—
`8.5.0`	affected	—
`8.4.0`	affected	—
`8.3.0`	affected	—
`8.2.1`	affected	—
`8.2.0`	affected	—
`8.1.2`	affected	—
`8.1.1`	affected	—
`8.1.0`	affected	—
`8.0.1`	affected	—
`8.0.0`	affected	—
`7.88.1`	affected	—
`7.88.0`	affected	—
`7.87.0`	affected	—
`7.86.0`	affected	—
`7.85.0`	affected	—
`7.84.0`	affected	—
`7.83.1`	affected	—
`7.83.0`	affected	—
`7.82.0`	affected	—
`7.81.0`	affected	—
`7.80.0`	affected	—
`7.79.1`	affected	—
`7.79.0`	affected	—
`7.78.0`	affected	—
`7.77.0`	affected	—
`7.76.1`	affected	—
`7.76.0`	affected	—
`7.75.0`	affected	—
`7.74.0`	affected	—
`7.73.0`	affected	—
`7.72.0`	affected	—
`7.71.1`	affected	—
`7.71.0`	affected	—
`7.70.0`	affected	—
`7.69.1`	affected	—
`7.69.0`	affected	—
`7.68.0`	affected	—
`7.67.0`	affected	—
`7.66.0`	affected	—
`7.65.3`	affected	—
`7.65.2`	affected	—
`7.65.1`	affected	—
`7.65.0`	affected	—
`7.64.1`	affected	—
`7.64.0`	affected	—
`7.63.0`	affected	—
`7.62.0`	affected	—
`7.61.1`	affected	—
`7.61.0`	affected	—
`7.60.0`	affected	—
`7.59.0`	affected	—
`7.58.0`	affected	—
`7.57.0`	affected	—
`7.56.1`	affected	—
`7.56.0`	affected	—
`7.55.1`	affected	—
`7.55.0`	affected	—
`7.54.1`	affected	—
`7.54.0`	affected	—
`7.53.1`	affected	—
`7.53.0`	affected	—
`7.52.1`	affected	—
`7.52.0`	affected	—
`7.51.0`	affected	—
`7.50.3`	affected	—
`7.50.2`	affected	—
`7.50.1`	affected	—
`7.50.0`	affected	—
`7.49.1`	affected	—
`7.49.0`	affected	—
`7.48.0`	affected	—
`7.47.1`	affected	—
`7.47.0`	affected	—
`7.46.0`	affected	—

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Curl

Version	Status	Scheme	Platform
`[8.20.0,8.20.0]`	affected	semver	—
`[8.19.0,8.19.0]`	affected	semver	—
`[8.18.0,8.18.0]`	affected	semver	—
`[8.17.0,8.17.0]`	affected	semver	—
`[8.16.0,8.16.0]`	affected	semver	—
`[8.15.0,8.15.0]`	affected	semver	—
`[8.14.1,8.14.1]`	affected	semver	—
`[8.14.0,8.14.0]`	affected	semver	—
`[8.13.0,8.13.0]`	affected	semver	—
`[8.12.1,8.12.1]`	affected	semver	—
`[8.12.0,8.12.0]`	affected	semver	—
`[8.11.1,8.11.1]`	affected	semver	—
`[8.11.0,8.11.0]`	affected	semver	—
`[8.10.1,8.10.1]`	affected	semver	—
`[8.10.0,8.10.0]`	affected	semver	—
`[8.9.1,8.9.1]`	affected	semver	—
`[8.9.0,8.9.0]`	affected	semver	—
`[8.8.0,8.8.0]`	affected	semver	—
`[8.7.1,8.7.1]`	affected	semver	—
`[8.7.0,8.7.0]`	affected	semver	—
`[8.6.0,8.6.0]`	affected	semver	—
`[8.5.0,8.5.0]`	affected	semver	—
`[8.4.0,8.4.0]`	affected	semver	—
`[8.3.0,8.3.0]`	affected	semver	—
`[8.2.1,8.2.1]`	affected	semver	—
`[8.2.0,8.2.0]`	affected	semver	—
`[8.1.2,8.1.2]`	affected	semver	—
`[8.1.1,8.1.1]`	affected	semver	—
`[8.1.0,8.1.0]`	affected	semver	—
`[8.0.1,8.0.1]`	affected	semver	—
`[8.0.0,8.0.0]`	affected	semver	—
`[7.88.1,7.88.1]`	affected	semver	—
`[7.88.0,7.88.0]`	affected	semver	—
`[7.87.0,7.87.0]`	affected	semver	—
`[7.86.0,7.86.0]`	affected	semver	—
`[7.85.0,7.85.0]`	affected	semver	—
`[7.84.0,7.84.0]`	affected	semver	—
`[7.83.1,7.83.1]`	affected	semver	—
`[7.83.0,7.83.0]`	affected	semver	—
`[7.82.0,7.82.0]`	affected	semver	—
`[7.81.0,7.81.0]`	affected	semver	—
`[7.80.0,7.80.0]`	affected	semver	—
`[7.79.1,7.79.1]`	affected	semver	—
`[7.79.0,7.79.0]`	affected	semver	—
`[7.78.0,7.78.0]`	affected	semver	—
`[7.77.0,7.77.0]`	affected	semver	—
`[7.76.1,7.76.1]`	affected	semver	—
`[7.76.0,7.76.0]`	affected	semver	—
`[7.75.0,7.75.0]`	affected	semver	—
`[7.74.0,7.74.0]`	affected	semver	—
`[7.73.0,7.73.0]`	affected	semver	—
`[7.72.0,7.72.0]`	affected	semver	—
`[7.71.1,7.71.1]`	affected	semver	—
`[7.71.0,7.71.0]`	affected	semver	—
`[7.70.0,7.70.0]`	affected	semver	—
`[7.69.1,7.69.1]`	affected	semver	—
`[7.69.0,7.69.0]`	affected	semver	—
`[7.68.0,7.68.0]`	affected	semver	—
`[7.67.0,7.67.0]`	affected	semver	—
`[7.66.0,7.66.0]`	affected	semver	—
`[7.65.3,7.65.3]`	affected	semver	—
`[7.65.2,7.65.2]`	affected	semver	—
`[7.65.1,7.65.1]`	affected	semver	—
`[7.65.0,7.65.0]`	affected	semver	—
`[7.64.1,7.64.1]`	affected	semver	—
`[7.64.0,7.64.0]`	affected	semver	—
`[7.63.0,7.63.0]`	affected	semver	—
`[7.62.0,7.62.0]`	affected	semver	—
`[7.61.1,7.61.1]`	affected	semver	—
`[7.61.0,7.61.0]`	affected	semver	—
`[7.60.0,7.60.0]`	affected	semver	—
`[7.59.0,7.59.0]`	affected	semver	—
`[7.58.0,7.58.0]`	affected	semver	—
`[7.57.0,7.57.0]`	affected	semver	—
`[7.56.1,7.56.1]`	affected	semver	—
`[7.56.0,7.56.0]`	affected	semver	—
`[7.55.1,7.55.1]`	affected	semver	—
`[7.55.0,7.55.0]`	affected	semver	—
`[7.54.1,7.54.1]`	affected	semver	—
`[7.54.0,7.54.0]`	affected	semver	—
`[7.53.1,7.53.1]`	affected	semver	—
`[7.53.0,7.53.0]`	affected	semver	—
`[7.52.1,7.52.1]`	affected	semver	—
`[7.52.0,7.52.0]`	affected	semver	—
`[7.51.0,7.51.0]`	affected	semver	—
`[7.50.3,7.50.3]`	affected	semver	—
`[7.50.2,7.50.2]`	affected	semver	—
`[7.50.1,7.50.1]`	affected	semver	—
`[7.50.0,7.50.0]`	affected	semver	—
`[7.49.1,7.49.1]`	affected	semver	—
`[7.49.0,7.49.0]`	affected	semver	—
`[7.48.0,7.48.0]`	affected	semver	—
`[7.47.1,7.47.1]`	affected	semver	—
`[7.47.0,7.47.0]`	affected	semver	—
`[7.46.0,7.46.0]`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DSA	DSA-6558-1	curl security update
Ubuntu USN	USN-8487-1	curl vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.661% probability within 30 days)

Exploitation poc

Automatable yes

Technical Impact total

References

Link	Providers
https://curl.se/docs/CVE-2026-8924.html
https://curl.se/docs/CVE-2026-8924.json
https://hackerone.com/reports/3733905
https://nvd.nist.gov/vuln/detail/CVE-2026-8924
https://www.cve.org/CVERecord?id=CVE-2026-8924

History

Sep 15, 2026 6:45 AM Description updated. Weaknesses updated View changes

Type	Values Removed	Values Added
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.	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.
Weaknesses		CWE-201

Jul 8, 2026 12:00 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-610

Jul 7, 2026 12:15 PM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-565
References		https://nvd.nist.gov/vuln/detail/CVE-2026-8924 https://www.cve.org/CVERecord?id=CVE-2026-8924
Metrics	threat_severity `None`	threat_severity `Moderate`

Jul 7, 2026 8:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-610

Jul 6, 2026 10:45 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-20

Jul 6, 2026 5:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jul 6, 2026 10:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20

Jul 6, 2026 4:45 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-284

Jul 5, 2026 8:45 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-284

Jul 5, 2026 12:30 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-20

Jul 5, 2026 1:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20

Jul 4, 2026 12:45 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-20 CWE-639

Jul 4, 2026 1:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20 CWE-639

Jul 3, 2026 9:00 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-20 CWE-613

Jul 3, 2026 1:15 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20 CWE-613

Jul 3, 2026 11:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Curl Curl curl
Vendors & Products		Curl Curl curl

Jul 3, 2026 6:45 AM Description updated. Title updated. Added references View changes

Type	Values Removed	Values Added
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.
Title		trailing dot domain super cookie
References		https://curl.se/docs/CVE-2026-8924.html https://curl.se/docs/CVE-2026-8924.json https://hackerone.com/reports/3733905