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Vulnerability · Published Mar 30, 2026 · Assigned by GitHub_M

CVE-2026-33995FreeRDP: Possible double free in kerberos_AcceptSecurityContext

Medium 5.3

In plain English

A medium-severity double free in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 78.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a double-free vulnerability in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c) can cause a crash in any FreeRDP clients on systems where Kerberos and/or Kerberos U2U is configured (Samba AD member, or krb5 for NFS). The crash is triggered during NLA connection teardown and requires a failed authentication attempt. This issue has been patched in version 3.24.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23freerdp3.24.2-r0ALPINE-CVE-2026-33995
Alpine:v3.24freerdp3.24.2-r0ALPINE-CVE-2026-33995
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-33995
Debian:13freerdp33.15.0+dfsg-2.1+deb13u2DEBIAN-CVE-2026-33995
Debian:14freerdp33.24.2+dfsg-1DEBIAN-CVE-2026-33995
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-33995
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1USN-8561-1
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-33995
Ubuntu:25.10freerdp3no fix listedUBUNTU-CVE-2026-33995
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1USN-8561-1

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.24.2

Weakness: CWE-415 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References