# CVE-2022-0137: Memory corruption in htmldoc

> A heap buffer overflow in HTMLDOC allows attackers to write outside buffer boundaries, potentially leading to code execution or crashes.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 14 Nov 2022
- **Updated:** 25 Apr 2025
- **Also known as:** DEBIAN-CVE-2022-0137, GHSA-f2rv-ggmm-f4p9, UBUNTU-CVE-2022-0137

## What is CVE-2022-0137?

CVE-2022-0137 is a high-severity memory corruption vulnerability in michaelrsweet htmldoc, published on 14 Nov 2022. 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

A heap buffer overflow in image_set_mask function of HTMLDOC before 1.9.15 allows an attacker to write outside the buffer boundaries.

Weakness: CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2022-0137?

It affects 1 product.


Products: Htmldoc Project Htmldoc.

## How do I fix CVE-2022-0137?

Upgrade to a fixed version.

## Is CVE-2022-0137 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-0137 exists.

## Other vulnerabilities in michaelrsweet htmldoc

- [CVE-2024-46478](https://insights.sbomify.com/CVE-2024-46478/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-45508](https://insights.sbomify.com/CVE-2024-45508/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-23158](https://insights.sbomify.com/CVE-2021-23158/): Memory corruption in htmldoc (critical 9.8)
- [CVE-2021-23165](https://insights.sbomify.com/CVE-2021-23165/): Memory corruption in htmldoc (critical 9.8)
- [CVE-2021-34119](https://insights.sbomify.com/CVE-2021-34119/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-0137 and fix it if it is affected.

What it is: CVE-2022-0137 is a high-severity memory corruption vulnerability in michaelrsweet htmldoc, published on 14 Nov 2022. 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-2022-0137 exists.

Affected product: michaelrsweet htmldoc. 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-2022-0137/ (Markdown: https://insights.sbomify.com/CVE-2022-0137/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-0137
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-0137
- OSV: https://osv.dev/vulnerability/CVE-2022-0137

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-0137/
Summaries are generated and may contain mistakes; the official description above is the record.