CVE-2026-8924 - Vulnerability Details

- trailing dot domain super cookie

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.

Published: 2026-07-03

Score: 9.1 Critical

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

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

No data.

Vendor Product Confidence Versions

Curl

100%

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	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Ubuntu USN	USN-8487-1	curl vulnerabilities

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.

The EPSS score is 0.00219.

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

Wed, 08 Jul 2026 00:00:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-610

Tue, 07 Jul 2026 12:15:00 +0000

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`

Tue, 07 Jul 2026 08:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-610

Mon, 06 Jul 2026 22:45:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-20

Mon, 06 Jul 2026 17:30:00 +0000

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'}`

Mon, 06 Jul 2026 10:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-20

Mon, 06 Jul 2026 04:45:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-284

Sun, 05 Jul 2026 20:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-284

Sun, 05 Jul 2026 12:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-20

Sun, 05 Jul 2026 01:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-20

Sat, 04 Jul 2026 12:45:00 +0000

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

Sat, 04 Jul 2026 01:30:00 +0000

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

Fri, 03 Jul 2026 21:00:00 +0000

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

Fri, 03 Jul 2026 13:15:00 +0000

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

Fri, 03 Jul 2026 11:15:00 +0000

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

Fri, 03 Jul 2026 06:45:00 +0000

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

Subscriptions

Curl Curl

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:15:04.646Z

Updated: 2026-07-06T16:57:16.362Z

Reserved: 2026-05-19T08:11:35.441Z

Link: CVE-2026-8924

Vulnrichment

Updated: 2026-07-06T16:57:12.247Z

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-07-03T06:15:04Z

Links: CVE-2026-8924 - Bugzilla

OpenCVE Enrichment

Updated: 2026-07-07T23:45:04Z

Weaknesses

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

Exploitation poc

Automatable yes

Technical Impact total

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object