# CVE-2026-112892: Pillow: MSP RLE decoder expands a tiny file into unbounded memory

> Attackers can cause memory exhaustion and denial of service by supplying crafted MSP images to applications using the Pillow library.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 19 Oct 2026
- **Updated:** 22 Oct 2026
- **Also known as:** BIT-pillow-2026-112892, DEBIAN-CVE-2026-112892, ECHO-c72f-4fcc-64f4, GHSA-gg2r-wvfm-q9rx, ROOT-APP-PYPI-CVE-2026-112892, UBUNTU-CVE-2026-112892

## What is CVE-2026-112892?

CVE-2026-112892 is a high-severity denial of service vulnerability in Python Pillow, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Pillow is a Python imaging library. From 4.1.0 until 13.0.0, Pillow's MSP RLE decoder can expand a small file into an unbounded in-memory buffer. The decoder writes run-length output to BytesIO without limiting expansion to the declared image size. An attacker can supply a crafted MSP image to an application that loads its pixels. This can exhaust memory and deny service even when the declared pixel count passes the decompression-bomb check. This issue is fixed in version 13.0.0.

Weakness: CWE-409 (Improper Handling of Highly Compressed Data (Data Amplification))

## Which versions are affected by CVE-2026-112892?

3 open source packages ship an affected version, including pillow. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `pillow` | Bitnami | From 4.1.0 | 13.0.0 |
| `pillow` | PyPI | From 4.1.0 | 13.0.0 |
| `pillow` | PyPI | From 4.1.0 | 13.0.0 |

Products: Python Pillow.

## How do I fix CVE-2026-112892?

Upgrade pillow to 13.0.0 or later.

## Is CVE-2026-112892 being exploited?

There is no known exploitation of CVE-2026-112892 in the wild and no public exploit code.

## Other vulnerabilities in Python Pillow

- [CVE-2014-3007](https://insights.sbomify.com/CVE-2014-3007/): Pillow command injection (critical 10.0)
- [CVE-2026-96639](https://insights.sbomify.com/CVE-2026-96639/): Pillow multi-frame loaders can reuse stale native image storage after mode transitions (critical 9.8)
- [CVE-2022-30595](https://insights.sbomify.com/CVE-2022-30595/): Buffer over-flow in Pillow (critical 9.8)
- [CVE-2021-25289](https://insights.sbomify.com/CVE-2021-25289/): Out of bounds write in Pillow (critical 9.8)
- [CVE-2016-4009](https://insights.sbomify.com/CVE-2016-4009/): Pillow Integer overflow in ImagingResampleHorizontal (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112892 and fix it if it is affected.

What it is: CVE-2026-112892 is a high-severity denial of service vulnerability in Python Pillow, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-112892 in the wild and no public exploit code.

Affected packages and fixed versions:
- pillow (Bitnami): affected from 4.1.0; fixed in 13.0.0
- pillow (PyPI): affected from 4.1.0; fixed in 13.0.0
- pillow (PyPI): affected from 4.1.0; fixed in 13.0.0

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-2026-112892/ (Markdown: https://insights.sbomify.com/CVE-2026-112892/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112892
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112892
- OSV: https://osv.dev/vulnerability/CVE-2026-112892

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112892/
Summaries are generated and may contain mistakes; the official description above is the record.