CVE-2026-4271 Details
Description
A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
A use-after-free vulnerability has been identified in libsoup, specifically within its HTTP/2 server implementation. This flaw allows remote attackers to cause authentication failures by sending specially crafted HTTP/2 requests. The vulnerability arises in the 'on_frame_recv_callback()' function, where the server processes HTTP/2 frames. If a user-defined signal handler disconnects the client during this process, the associated 'SoupServerMessageIOHTTP2' object may be freed while still in use, leading to a heap use-after-free condition. Consequently, this can cause application crashes or instability, creating a denial-of-service situation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 17, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/496 | CISA-ADP | ExploitIssue TrackingVendor Advisory |
| https://access.redhat.com/errata/RHSA-2026:15968 | [email protected] | |
| https://access.redhat.com/errata/RHSA-2026:17482 | [email protected] | |
| https://access.redhat.com/errata/RHSA-2026:19143 | [email protected] | |
| https://access.redhat.com/security/cve/CVE-2026-4271 | [email protected] | Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2448044 | [email protected] | Issue TrackingVendor Advisory |
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/496 | [email protected] | ExploitIssue TrackingVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| gnome libsoup | All versions |
CPE
Remediation
| |
| redhat enterprise linux | 6.0 7.0 8.0 9.0 10.0 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 19, 2026 | CVE Modified | [email protected] |
| May 14, 2026 | CVE Modified | [email protected] |
| May 11, 2026 | CVE Modified | [email protected] |
| Mar 19, 2026 | Initial Analysis | [email protected] |
| Mar 17, 2026 | CVE Modified | CISA-ADP |
| Mar 17, 2026 | New CVE Received | [email protected] |