CVE-2026-8924

HIGH

9.1

CVSS v3

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.

CWE-201

How to fix

Remediation Available

curlDebian

Fixed in:8.21.0~rc2-1CVE-2026-8924

curlRed Hat / RHEL

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

curlRocky

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

curl-debuginfoRed Hat / RHEL

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

curl-debuginfoRocky

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

curl-debugsourceRocky

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

curl-debugsourceRed Hat / RHEL

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

libcurlRed Hat / RHEL

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

libcurlRocky

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

libcurl-debuginfoRocky

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-debuginfoRed Hat / RHEL

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-develRocky

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-develRed Hat / RHEL

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-minimalRed Hat / RHEL

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-minimalRocky

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

libcurl-minimal-debuginfoRocky

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

libcurl-minimal-debuginfoRed Hat / RHEL

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

Fixed in:0:8.12.1-1.el10_0.10RHSA-2026:72506

Fixed in:0:8.12.1-4.el10_2.6RHSA-2026:69125

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

Fixed in:8.5.0-2ubuntu10.10USN-8487-1

Fixed in:8.14.1-2ubuntu1.4USN-8487-1

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

libcurl3t64-gnutlsUbuntu

Fixed in:8.5.0-2ubuntu10.10USN-8487-1

Fixed in:8.14.1-2ubuntu1.4USN-8487-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

libcurl4-gnutls-devUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

Fixed in:8.5.0-2ubuntu10.10USN-8487-1

Fixed in:8.14.1-2ubuntu1.4USN-8487-1

libcurl4-nss-devUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

libcurl4-openssl-devUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1

Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1

Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1

Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1

Fixed in:7.81.0-1ubuntu1.25USN-8487-1

Fixed in:8.5.0-2ubuntu10.10USN-8487-1

Fixed in:8.14.1-2ubuntu1.4USN-8487-1

libcurl4t64Ubuntu

Fixed in:8.5.0-2ubuntu10.10USN-8487-1

Fixed in:8.14.1-2ubuntu1.4USN-8487-1

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.66%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Patch1

curl.se

Exploit1

hackerone.com

Vendor Advisory1

curl.se

Related Vulnerabilities

Other CWE-201 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-60188	High	7.5	3.7%	-	-
CVE-2022-27779	Medium	5.3	2.7%	-	Fix
CVE-2017-16026	Medium	5.9	2.6%	-	Fix
CVE-2017-2582	Medium	6.5	2.4%	-	Fix
CVE-2020-26085	Critical	9.9	2.3%	-	Fix
CVE-2024-32825	High	7.5	2.0%	-	-

Common questions

How do I fix CVE-2026-8924?

Published advisories record a fix for 27 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-8924 being actively exploited?

Not that we know of. CVE-2026-8924 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.66% is the estimated probability that it will be exploited in the next 30 days. That is higher than 50% of all scored CVEs.

How severe is CVE-2026-8924?

CVE-2026-8924 has a CVSS v3 base score of 9.1, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-8924 affect?

Published advisories record a fix for curl (Debian), curl (Red Hat / RHEL), curl (Rocky), curl-debuginfo (Red Hat / RHEL), and 23 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-15.