# CVE-2003-0107: Memory corruption in n/a

> A buffer overflow in zlib's gzprintf function allows attackers to execute arbitrary code or cause denial of service under specific compilation conditions.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Sep 2004
- **Updated:** 8 Aug 2024
- **Also known as:** DEBIAN-CVE-2003-0107, ECHO-0622-cae2-8ce2, GHSA-c9pj-8qx8-ccrw

## What is CVE-2003-0107?

CVE-2003-0107 is a high-severity memory corruption vulnerability in n/a, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.

## Which versions are affected by CVE-2003-0107?

It affects 1 product.


Products: Zlib Zlib.

## How do I fix CVE-2003-0107?

Upgrade to a fixed version.

## Is CVE-2003-0107 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2003-0107 exists.

Public exploit code:

- Zlib 1.1.4 - Compression Library 'gzprintf()' Buffer Overrun (1) (exploitdb)
- Zlib 1.1.4 - Compression Library 'gzprintf()' Buffer Overrun (2) (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2002-0059](https://insights.sbomify.com/CVE-2002-0059/): Use after free in n/a (critical 9.8)
- [CVE-2005-2096](https://insights.sbomify.com/CVE-2005-2096/): Memory corruption in n/a (high 7.5)
- [CVE-2005-1849](https://insights.sbomify.com/CVE-2005-1849/): Denial of service in n/a (medium 5.0)
- [CVE-2026-22184](https://insights.sbomify.com/CVE-2026-22184/): zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname() (medium 4.6)
- [CVE-2026-27171](https://insights.sbomify.com/CVE-2026-27171/): Denial of service in zlib (low 2.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2003-0107 and fix it if it is affected.

What it is: CVE-2003-0107 is a high-severity memory corruption vulnerability in n/a, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2003-0107 exists.

Affected product: n/a. 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-2003-0107/ (Markdown: https://insights.sbomify.com/CVE-2003-0107/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2003-0107
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2003-0107
- OSV: https://osv.dev/vulnerability/CVE-2003-0107

---
From sbomify Insights: https://insights.sbomify.com/CVE-2003-0107/
Summaries are generated and may contain mistakes; the official description above is the record.