# CVE-2026-45700: Heap-buffer-overflow write in planar bitmap decoder

> An attacker can trigger a heap buffer overflow in FreeRDP's planar bitmap decoder, potentially leading to arbitrary code execution.

- **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/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:** Yes
- **Published:** 29 May 2026
- **Updated:** 29 Jul 2026
- **Also known as:** ALSA-2026:37207, ALSA-2026:38501, DEBIAN-CVE-2026-45700, GHSA-mpxh-8fq3-x8mh, MINI-9x4f-vmc6-2mw5, RHSA-2026:37207, RHSA-2026:38501, RHSA-2026:46383, RHSA-2026:46384, RHSA-2026:46388, RHSA-2026:46389, RHSA-2026:47048, RHSA-2026:47049, RHSA-2026:47201, RLSA-2026:37207, RLSA-2026:38501, UBUNTU-CVE-2026-45700, USN-8432-1

## What is CVE-2026-45700?

CVE-2026-45700 is a high-severity memory corruption vulnerability in Freerdp Freerdp, published on 29 May 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 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-45700?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `freerdp` | AlmaLinux:8 | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-devel` | AlmaLinux:8 | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-libs` | AlmaLinux:8 | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr` | AlmaLinux:8 | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr-devel` | AlmaLinux:8 | All versions | 2:2.11.7-10.el8_10 |
| `freerdp` | AlmaLinux:9 | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-devel` | AlmaLinux:9 | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-libs` | AlmaLinux:9 | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr` | AlmaLinux:9 | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr-devel` | AlmaLinux:9 | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-libs` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-libs-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr-devel` | Red Hat:enterprise_linux:8::appstream | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-devel` | Red Hat:enterprise_linux:8::crb | All versions | 2:2.11.7-10.el8_10 |
| `freerdp-libs-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 2:2.11.7-10.el8_10 |
| `libwinpr-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 2:2.11.7-10.el8_10 |
| `freerdp` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-libs` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-libs-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-debugsource` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-devel` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp-libs-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `libwinpr-devel` | Red Hat:enterprise_linux:9::crb | All versions | 2:2.11.7-7.el9_8.4 |
| `freerdp` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:2.2.0-14.el8_4.1 |
| `freerdp-debuginfo` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:2.2.0-14.el8_4.1 |
| `freerdp-debugsource` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:2.2.0-14.el8_4.1 |
| `freerdp-libs` | Red Hat:rhel_aus:8.4::appstream | All versions | 2:2.2.0-14.el8_4.1 |

Products: Freerdp Freerdp.

## How do I fix CVE-2026-45700?

Upgrade to a fixed version.

## Is CVE-2026-45700 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45700 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-2026-45700 and fix it if it is affected.

What it is: CVE-2026-45700 is a high-severity memory corruption vulnerability in Freerdp Freerdp, published on 29 May 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-2026-45700 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-2026-45700/ (Markdown: https://insights.sbomify.com/CVE-2026-45700/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45700
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45700
- OSV: https://osv.dev/vulnerability/CVE-2026-45700

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45700/
Summaries are generated and may contain mistakes; the official description above is the record.