Double free in cURL - CVE-2026-8925

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Main Vulnerability Database Vulnerabilities #VU135083

Double free in cURL - CVE-2026-8925

Published: June 24, 2026


Vulnerability identifier: #VU135083
CSH Severity: Low
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-8925
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to double free in the SASL authentication logic when processing SASL authentication with a malicious server response. A remote user can influence server behavior to trigger the double free and cause a denial of service.

Only builds using libgsasl are vulnerable, and the issue can be triggered over IMAP, POP3, and SMTP.


Affected software

cURL
LANTIME Operating System Firmware (LTOS)
Ubuntu
openEuler
Fedora
curl (Ubuntu package)
curl-debugsource
libcurl
libcurl-devel
curl-help
curl-debuginfo
curl

How to mitigate CVE-2026-8925

Install security update from vendor's website.

cURL - update to 8.21.0
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
curl (Ubuntu package) - addressed in versions 7.35.0-1ubuntu2.20+esm20, 7.35.0-1ubuntu2.20+esm23, 7.47.0-1ubuntu2.19+esm16, 7.58.0-2ubuntu3.24+esm9, 7.68.0-1ubuntu2.25+esm4, 7.81.0-1ubuntu1.25, 8.5.0-2ubuntu10.10, 8.14.1-2ubuntu1.4, 8.18.0-1ubuntu2.2
curl-debugsource - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
libcurl - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
libcurl-devel - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
curl-help - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
curl-debuginfo - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
curl - addressed in versions 7.71.1-52, 7.79.1-53, 8.4.0-35
curl - addressed in versions 8.15.0-9.fc43, 8.18.0-9.fc44

External References

Related Security Bulletins