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Vulnerability · Published Mar 26, 2026 · Assigned by redhat

CVE-2026-2436Libsoup: libsoup: denial of service via use-after-free in soupserver during tls handshake

Medium 6.5

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 60.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in libsoup's SoupServer. A remote attacker could exploit a use-after-free vulnerability where the `soup_server_disconnect()` function frees connection objects prematurely, even if a TLS handshake is still pending. If the handshake completes after the connection object has been freed, a dangling pointer is accessed, leading to a server crash and a Denial of Service.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libsoup2.4no fix listedDEBIAN-CVE-2026-2436
Debian:13libsoup2.4no fix listedDEBIAN-CVE-2026-2436
Debian:12libsoup3no fix listedDEBIAN-CVE-2026-2436
Debian:13libsoup3no fix listedDEBIAN-CVE-2026-2436
Ubuntu:24.04:LTSlibsoup3no fix listedUBUNTU-CVE-2026-2436
Ubuntu:25.10libsoup3no fix listedUBUNTU-CVE-2026-2436
Ubuntu:26.04:LTSlibsoup3no fix listedUBUNTU-CVE-2026-2436
Ubuntu:26.10libsoup3no fix listedUBUNTU-CVE-2026-2436

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-825 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

References