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Fencer Intel
medium 6.5

CVE-2026-121394 json

FreeRDP before 3.32.2 Denial of Service via RemoteFX RLGR decoder

published 6d ago modified 2d ago also EUVD-2026-115926

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

FreeRDP from 3.11.0 before 3.32.2 contains an assertion failure in the RemoteFX RLGR decoder that allows malicious servers to terminate clients. Attackers controlling an RDP server can send a RemoteFX tileset with RLGR code 32767, triggering a signed narrowing assertion in rfx_rlgr_decode and crashing the client.

Patch / fix

  • FreeRDP FreeRDP 3.32.2
  • freerdp3 Debian 14 3.32.2+dfsg-1

debian advisories DEBIAN-CVE-2026-121394

  • freerdp3 Ubuntu 24.04 LTS 3.32.2+dfsg-0ubuntu0.24.04.1
  • freerdp3 Ubuntu 26.10 3.32.2+dfsg-0ubuntu0.26.10.1
  • freerdp3 Ubuntu 26.04 LTS 3.32.2+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-121394

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp AlmaLinux 10 2:3.32.2-1.el10_2
  • libwinpr AlmaLinux 10 2:3.32.2-1.el10_2
  • freerdp-libs AlmaLinux 10 2:3.32.2-1.el10_2
  • freerdp-server AlmaLinux 10 2:3.32.2-1.el10_2

almalinux advisories ALSA-2026:94514

Is CVE-2026-121394 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-121394 updated cvss 6.5

freerdp: FreeRDP: Denial of Service via assertion failure in RemoteFX decoder

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 8 freerdp, libwinpr, freerdp-libs Red Hat Enterprise Linux 9 freerdp, libwinpr, freerdp-libs
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.32.2-1.el10_2, libwinpr 3.32.2-1.el10_2, freerdp-libs 3.32.2-1.el10_2 Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.32.2-1.el10_2
    fixed: vendor fix RHSA-2026:94514

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2d ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5j39-x36c-x9pm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.