# CVE-2021-31598: Memory corruption in n/a

> A heap-based buffer overflow in ezXML allows attackers to execute arbitrary code or cause denial of service via crafted XML files.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-31598, GHSA-79rj-564v-63cr, UBUNTU-CVE-2021-31598

## What is CVE-2021-31598?

CVE-2021-31598 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 24 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in libezxml.a in ezXML 0.8.6. The function ezxml_decode() performs incorrect memory handling while parsing crafted XML files, leading to a heap-based buffer overflow.

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

## Which versions are affected by CVE-2021-31598?

It affects 2 products.


Products: Debian Debian Linux, Ezxml Project Ezxml.

## How do I fix CVE-2021-31598?

Apply the vendor's patch.

## Is CVE-2021-31598 being exploited?

There is no known exploitation of CVE-2021-31598 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31598 and fix it if it is affected.

What it is: CVE-2021-31598 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 24 Apr 2021. 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-2021-31598 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2021-31598/ (Markdown: https://insights.sbomify.com/CVE-2021-31598/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31598
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31598
- OSV: https://osv.dev/vulnerability/CVE-2021-31598

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31598/
Summaries are generated and may contain mistakes; the official description above is the record.