---
cve: "CVE-2026-39314"
severity: "MEDIUM"
cvss: 4.0
epss: "0.2%"
vendor: "OpenPrinting"
kev: false
exploited: false
published: "2026-04-07 17:16:37"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-19T03:17:00+02:00"
---

# CVE-2026-39314

> 4.0 MEDIUM · 🧪 PoC

## Beschreibung

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-06-23 15:51:28
- CNA-CVSS: **4.0** (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Schwachstellen-Klasse

- **CWE-191** — Integer Underflow (Wrap or Wraparound)
  The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

## BSI-Hinweise (deutsch)

- [CUPS: Mehrere Schwachstellen ermöglichen Denial of Service](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0994) — _BSI-Einstufung: niedrig_
  Ein Angreifer kann mehrere Schwachstellen in CUPS ausnutzen, um einen Denial of Service Angriff durchzuführen.

## Referenzen

- <https://github.com/OpenPrinting/cups/security/advisories/GHSA-pp8w-2g52-7vj7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-39314/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_