PT-2026-25895 · Libsoup · Libsoup

Fouzhe · CVE-2026-4271 · Published 2026-01-01 · Updated 2026-06-24

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions libsoup (affected versions not specified)

Description A Use-After-Free flaw exists in the libsoup library, specifically within the HTTP/2 server implementation. A remote attacker can exploit this by sending crafted HTTP/2 requests that trigger authentication failures. This can lead to the application attempting to access freed memory, potentially causing application instability, crashes, and a Denial of Service (DoS). The vulnerability affects applications relying on libsoup for handling HTTP requests.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2026:15968

ALSA-2026:19143

BDU:2026-04362

CVE-2026-4271

ECHO-8792-9C43-A7BA

OESA-2026-2698

OESA-2026-2699

OPENSUSE-SU-2026:10911-1

RHSA-2026:15968

RHSA-2026:17482

RHSA-2026:19143

SUSE-SU-2026:21998-1

SUSE-SU-2026:2314-1

Affected Products

Libsoup

References · 50

• 🔥 https://gitlab.gnome.org/GNOME/libsoup/-/issues/496 · Exploit
• https://osv.dev/vulnerability/OESA-2026-2699 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-04362 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-1761 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2026-4271 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:17482 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4271 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2443 · Security Note
• https://errata.almalinux.org/10/ALSA-2026-19143.html · Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-4271 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:15968 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4271 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2314-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:21998-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:15968 · Vendor Advisory