Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-03T06:17:34 libcurl: libcurl: Use-after-free via curl_easy_pause() in CURLMOPT_SOCKETFUNCTION callback 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CWE-825

Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers a use-after-free vulnerability, where libcurl attempts to store a flag using a dangling struct pointer immediately after that pointer's memory has been freed.

A flaw was found in libcurl. When `curl_easy_pause()` is called within the event-based `CURLMOPT_SOCKETFUNCTION` callback, a use-after-free vulnerability is triggered. This occurs because libcurl attempts to store a flag using a pointer to memory that has already been freed. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code.

This Important flaw in libcurl stems from a use-after-free vulnerability when `curl_easy_pause()` is called within the `CURLMOPT_SOCKETFUNCTION` callback. This could allow an attacker to achieve denial of service or arbitrary code execution without requiring user interaction or elevated privileges. While dependent on a specific application implementation, the broad adoption of libcurl means Red Hat products leveraging this callback pattern could be affected. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat Hardened Images 2026-06-24T00:00:00Z RHSA-2026:29017 curl-main-8.21.0-0.1.hum1 Red Hat Hardened Images 2026-07-02T00:00:00Z RHSA-2026:34975 rust-main-1.96.1-1.hum1 Red Hat Enterprise Linux 8 Not affected dotnet8.0 Red Hat JBoss Core Services Affected libcurl-1.dll Red Hat JBoss Core Services Affected libcurl.so https://www.cve.org/CVERecord?id=CVE-2026-9080 https://nvd.nist.gov/vuln/detail/CVE-2026-9080 https://curl.se/docs/CVE-2026-9080.html https://curl.se/docs/CVE-2026-9080.json https://hackerone.com/reports/3749204