# CVE-2026-31897: FreeRDP has an out-of-bounds read in `freerdp_bitmap_decompress_planar`

> An out-of-bounds read in FreeRDP allows attackers to cause crashes or leak memory when processing malformed bitmap data.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 13 Mar 2026
- **Updated:** 13 Mar 2026
- **Also known as:** DEBIAN-CVE-2026-31897, GHSA-xgv6-r22m-7c9x, MINI-vmqp-6f65-9356, UBUNTU-CVE-2026-31897

## What is CVE-2026-31897?

CVE-2026-31897 is a memory corruption vulnerability in Freerdp Freerdp, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, there is an out-of-bounds read in freerdp_bitmap_decompress_planar when SrcSize is 0. The function dereferences *srcp (which points to pSrcData) without first verifying that SrcSize >= 1. When SrcSize is 0 and pSrcData is non-NULL, this reads one byte past the end of the source buffer. This vulnerability is fixed in 3.24.0.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-31897?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2026-31897?

Upgrade to a fixed version.

## Is CVE-2026-31897 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31897 exists.

## Other vulnerabilities in Freerdp Freerdp

- [CVE-2021-37594](https://insights.sbomify.com/CVE-2021-37594/): Other in n/a (critical 9.8)
- [CVE-2021-37595](https://insights.sbomify.com/CVE-2021-37595/): Other in n/a (critical 9.8)
- [CVE-2026-67305](https://insights.sbomify.com/CVE-2026-67305/): FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr (critical 9.4)
- [CVE-2026-66402](https://insights.sbomify.com/CVE-2026-66402/): FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass (critical 9.3)
- [CVE-2026-67289](https://insights.sbomify.com/CVE-2026-67289/): FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31897 and fix it if it is affected.

What it is: CVE-2026-31897 is a memory corruption vulnerability in Freerdp Freerdp, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31897 exists.

Affected product: Freerdp 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-2026-31897/ (Markdown: https://insights.sbomify.com/CVE-2026-31897/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31897
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31897
- OSV: https://osv.dev/vulnerability/CVE-2026-31897

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-31897/
Summaries are generated and may contain mistakes; the official description above is the record.