FreeRDP before 3.32.2 Heap Overflow via RDPGFX CREATE_SURFACE Integer Wrap
Affects FreeRDP clients before 3.32.2 that use the RDPGFX channel with software GDI decoding when connecting to a malicious or compromised RDP server. Fixed in 3.32.2.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- Proof of concept public, per CISA
- Fix
- Fixed in 3.32.2
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Victim uses a FreeRDP client with the RDPGFX dynamic virtual channel and software GDI decoding enabled Victim initiates a connection to a malicious or compromised RDP server For the heap overwrite, the client and the relevant WinPR fallback allocator use a 32-bit size_t
- Exploitation15/40CISA rates a proof of concept as public
- 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-2026-121950 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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? →
- 34/100 · 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
- Exploitation: poc
- Automatable: no
- Technical impact: partial
Summary
FreeRDP, a client library for the Remote Desktop Protocol, is affected before version 3.32.2 (version numbers omitted per page rules). A malicious RDP server can remotely, without logging in, send a crafted graphics surface request to a connecting client, which requires the user to take action such as connecting to that server; this can corrupt heap memory or crash the client, causing a denial of service.
Read the original description
FreeRDP before 3.32.2 does not check the product of surface dimensions in gdi_CreateSurface when handling an RDPGFX CREATE_SURFACE PDU, causing an integer wrap and heap buffer overflow on 32-bit builds and an approximately 4 GiB allocation on 64-bit builds. A malicious RDP server can send a CREATE_SURFACE PDU with width and height 32766 to a connecting client to corrupt heap memory or cause a denial of service.
What to do
Check whether your setup matches what the bug needs.
Victim uses a FreeRDP client with the RDPGFX dynamic virtual channel and software GDI decoding enabled Victim initiates a connection to a malicious or compromised RDP server For the heap overwrite, the client and the relevant WinPR fallback allocator use a 32-bit size_tUpgrade to a fixed version: 3.32.2.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: poc · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- FreeRDP FreeRDP
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-2026-121950
Is CVE-2026-121950 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. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A malicious or compromised RDP server can cause an integer wrap during CREATE_SURFACE handling on the RDPGFX channel, which can corrupt heap memory or crash the connecting client.Source: github.com, vulncheck.com
Which versions are affected by CVE-2026-121950?
FreeRDP: before 3.32.2.Source: cve.now feed data
Am I affected, and how do I check?
FreeRDP versions before 3.32.2 are affected when the client uses the RDPGFX dynamic virtual channel with software GDI decoding enabled and connects to a malicious or compromised server. The heap overwrite part also requires a 32-bit size_t in the client and the relevant WinPR fallback allocator. Check the installed FreeRDP version and whether these channel and decoding settings are enabled in the client configuration.Source: github.com, vulncheck.com
How do I fix CVE-2026-121950?
Upgrade to FreeRDP 3.32.2 or later.Source: github.com, vulncheck.com