# CVE-2019-6129: Denial of service in n/a

> A memory leak in libpng's png_create_info_struct function can lead to resource exhaustion and denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 11 Jan 2019
- **Updated:** 28 May 2026
- **Also known as:** DEBIAN-CVE-2019-6129, GHSA-rrr4-g4q4-hgr3, UBUNTU-CVE-2019-6129, openSUSE-SU-2024:13577-1

## What is CVE-2019-6129?

CVE-2019-6129 is a medium-severity denial of service vulnerability in Libpng Libpng, published on 11 Jan 2019. 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

png_create_info_struct in png.c in libpng 1.6.36 has a memory leak, as demonstrated by pngcp. NOTE: a third party has stated "I don't think it is libpng's job to free this buffer.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2019-6129?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libpng16` | openSUSE:Tumbleweed | All versions | 1.6.40-2.1 |

Products: Libpng Libpng.

## How do I fix CVE-2019-6129?

Apply the vendor's patch.

## Is CVE-2019-6129 being exploited?

There is no known exploitation of CVE-2019-6129 in the wild and no public exploit code.

## Other vulnerabilities in Libpng Libpng

- [CVE-2017-12652](https://insights.sbomify.com/CVE-2017-12652/): Denial of service in n/a (critical 9.8)
- [CVE-2018-14550](https://insights.sbomify.com/CVE-2018-14550/): Out-of-bounds write in libpng (high 8.8)
- [CVE-2026-25646](https://insights.sbomify.com/CVE-2026-25646/): LIBPNG has a heap buffer overflow in png_set_quantize (high 8.3)
- [CVE-2026-33636](https://insights.sbomify.com/CVE-2026-33636/): LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64 (high 7.6)
- [CVE-2026-33416](https://insights.sbomify.com/CVE-2026-33416/): LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6129 and fix it if it is affected.

What it is: CVE-2019-6129 is a medium-severity denial of service vulnerability in Libpng Libpng, published on 11 Jan 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-6129 in the wild and no public exploit code.

Affected product: Libpng Libpng. 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-2019-6129/ (Markdown: https://insights.sbomify.com/CVE-2019-6129/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6129
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6129
- OSV: https://osv.dev/vulnerability/CVE-2019-6129

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6129/
Summaries are generated and may contain mistakes; the official description above is the record.