---
cve: "CVE-2026-22691"
severity: "LOW"
cvss: 2.7
epss: "41%"
vendor: "py-pdf"
kev: false
exploited: false
published: "2026-01-10 05:16:08"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T03:40:59+02:00"
---

# CVE-2026-22691

> 2.7 LOW · 🧪 PoC

## Beschreibung

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 10df9c72fa7fb9ab14101b9cb911d66e680282a8 (Commit)
- 294165726b646bb7799be1cc787f593f2fdbcf45 (Commit)

## Referenzen

- <https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv>
- <https://github.com/py-pdf/pypdf/pull/3594>
- <https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45>
- <https://github.com/py-pdf/pypdf/releases/tag/6.6.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-22691) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_