CVE-2026-121959 FreeRDP before 3.32.2 Infinite Loop via Truncated WebSocket Frame
High 7.1
Published
Updated
Check this codebase for CVE-2026-121959 and fix it if it is affected.
What it is: CVE-2026-121959 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121959 exists.
Affected product: FreeRDP. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-121959/ (Markdown: https://insights.sbomify.com/CVE-2026-121959/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-121959?
CVE-2026-121959 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.
Official description
FreeRDP before 3.32.2 contains an infinite loop vulnerability in websocket_context_read that fails to handle a zero BIO result with payload outstanding. A malicious RD Gateway can send a truncated WebSocket frame followed by a TLS close_notify, causing a client thread to spin and consume CPU until killed.
Weakness: CWE-835
Which versions are affected by CVE-2026-121959?
It affects 1 product.
Products include FreeRDP.
How do I fix CVE-2026-121959?
Upgrade to a fixed version.
Is CVE-2026-121959 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121959 exists.
Other vulnerabilities in FreeRDP
- CVE-2024-32658 FreeRDP ExtractRunLengthRegular* out of bound read
- CVE-2024-32659 freerdp_image_copy out of bound read
- CVE-2024-32039 FreeRDP Integer overflow & OutOfBound Write in clear_decompress_residual_data
- CVE-2024-32041 FreeRDP OutOfBound Read in zgfx_decompress_segment
- CVE-2024-32458 FreeRDP Out-Of-Bounds Read in planar_skip_plane_rle
Sources
Also known as DEBIAN-CVE-2026-121959, GHSA-8rqh-cpfg-mwcc, GHSA-x26g-fp9v-c2pg, UBUNTU-CVE-2026-121959.