FreeRDP before 3.32.2 Denial of Service via RemoteFX RLGR decoder
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 3.32.2
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. FreeRDP versions 3.11.0 through 3.32.1 are affected Client has RemoteFX surface decoding enabled Build has assertions enabled (WITH_VERBOSE_WINPR_ASSERT on); with the option disabled the conversion does not assert
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure12/25Specific setups only, reachable over the network without a login
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 69 if added to CISA KEV
- Would score about 64 if CISA's SSVC rates exploitation active
CVE-2026-121394 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects FreeRDP; fixed in 3.32.2.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 19/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Fix
- Fixed in 3.32.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
FreeRDP, a widely used open-source Remote Desktop Protocol client library, is affected by this flaw. A malicious RDP server can send specially crafted RemoteFX data that crashes the connecting client, causing a denial of service.
Read the original description
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.
What to do
Check whether your setup matches what the bug needs.
FreeRDP versions 3.11.0 through 3.32.1 are affected Client has RemoteFX surface decoding enabled Build has assertions enabled (WITH_VERBOSE_WINPR_ASSERT on); with the option disabled the conversion does not assertUpgrade to a fixed version: 3.32.2.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- FreeRDP FreeRDP
From 3.11.0 · fixed in 3.32.2
Evidence 2
- Advisory
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-121394
Is CVE-2026-121394 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A malicious RDP server can crash the connected FreeRDP client process by sending data that triggers a failed assertion in the RemoteFX RLGR decoder. The advisory describes this as denial of service only, with no memory corruption, confidentiality, or integrity impact demonstrated.Source: github.com, vulncheck.com
Which versions are affected by CVE-2026-121394?
FreeRDP: from 3.11.0 before 3.32.2.Source: cve.now feed data
Am I affected, and how do I check?
FreeRDP versions 3.11.0 through 3.32.1 are affected. The bug needs a client with RemoteFX surface decoding enabled and a build with assertions on (WITH_VERBOSE_WINPR_ASSERT enabled, which is the default); the check the advisory points to is that build option and the client's RemoteFX setting.Source: github.com, vulncheck.com
How do I fix CVE-2026-121394?
Upgrade FreeRDP to version 3.32.2, which fixes the issue.Source: github.com, vulncheck.com