# CVE-2020-27818: pngcheck: A flaw was found in the check_chunk_name() function of pngcheck-2.4.0

CVE-2020-27818 is fixed in pngcheck on 1 platform, first by pngcheck 2.3.0-7ubuntu0.18.04.1~esm1, released August 23, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-27818
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0122
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 7, 2020

## Description

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pngcheck Ubuntu 18.04.6 LTS (bionic) | 2.3.0-7ubuntu0.18.04.1~esm1 | [pngcheck 2.3.0-7ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-pngcheck-2.3.0-7ubuntu0.18.04.1-esm1.md) | Aug 23, 2022 |
| Linux | pngcheck Ubuntu 20.04 LTS (focal) | 2.3.0-7ubuntu0.20.04.1 | [pngcheck 2.3.0-7ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-pngcheck-2.3.0-7ubuntu0.20.04.1.md) | Aug 23, 2022 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.