CVE-2026-4271

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).

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:15968
https://access.redhat.com/errata/RHSA-2026:17482
https://access.redhat.com/errata/RHSA-2026:19143
https://access.redhat.com/security/cve/CVE-2026-4271	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2448044	Issue Tracking Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/496	Exploit Issue Tracking Vendor Advisory
https://gitlab.gnome.org/GNOME/libsoup/-/issues/496	Exploit Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gnome:libsoup:-:::::::*
	cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:10.0:::::::*

History

No history.

Information

Published : 2026-03-17 12:16

Updated : 2026-06-17 10:56

NVD link : CVE-2026-4271

Mitre link : CVE-2026-4271

CVE.ORG link : CVE-2026-4271

JSON object : View

Products Affected

redhat

enterprise_linux

gnome

libsoup

CWE

CWE-416

Use After Free

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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)."}, {"lang": "es", "value": "Se encontr\u00f3 un defecto en libsoup, una biblioteca para manejar solicitudes HTTP. Esta vulnerabilidad, conocida como un uso despu\u00e9s de liberaci\u00f3n, ocurre en la implementaci\u00f3n del servidor HTTP/2. Un atacante remoto puede explotar esto enviando solicitudes HTTP/2 especialmente dise\u00f1adas que causan fallos de autenticaci\u00f3n. Esto puede llevar a que la aplicaci\u00f3n intente acceder a memoria que ya ha sido liberada, lo que podr\u00eda causar inestabilidad o ca\u00eddas de la aplicaci\u00f3n, resultando en una denegaci\u00f3n de servicio (DoS)."}], "lastModified": "2026-06-17T10:56:20.210", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C5BAC4F4-3ACD-4F4D-920C-F920FD2C5472"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}