# CVE-2026-112279: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2

> A heap out-of-bounds read in rdesktop allows malicious RDP servers to crash clients via crafted bitmap cache orders.

- **Severity:** High 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`)
- **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:** No
- **Published:** 19 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-112279, GHSA-3rm3-gwm3-q9hj, UBUNTU-CVE-2026-112279

## What is CVE-2026-112279?

CVE-2026-112279 is a high-severity memory corruption vulnerability in rdesktop, published on 19 Oct 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

rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() reads past the receive buffer and denial of service.

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

## Which versions are affected by CVE-2026-112279?


## How do I fix CVE-2026-112279?

No fix has been published for CVE-2026-112279 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-112279 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112279 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112279 and fix it if it is affected.

What it is: CVE-2026-112279 is a high-severity memory corruption vulnerability in rdesktop, published on 19 Oct 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-2026-112279 exists.

Affected product: rdesktop. 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-2026-112279/ (Markdown: https://insights.sbomify.com/CVE-2026-112279/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112279
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112279
- OSV: https://osv.dev/vulnerability/CVE-2026-112279

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112279/
Summaries are generated and may contain mistakes; the official description above is the record.