---
cve: "CVE-2026-27888"
severity: "MEDIUM"
cvss: 6.6
epss: "35%"
vendor: "py-pdf"
kev: false
exploited: false
published: "2026-02-26 01:16:25"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T03:41:14+02:00"
---

# CVE-2026-27888

> 6.6 MEDIUM · 🧪 PoC

## Beschreibung

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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)

- 05e6d3c03deaec6b16b53825465537ac9e7a1a14 (Commit)
- 7a4c8246ed48d9d328fb596942271da47b6d109c (Commit)

## Referenzen

- <https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj>
- <https://github.com/py-pdf/pypdf/pull/3658>
- <https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c>
- <https://github.com/py-pdf/pypdf/releases/tag/6.7.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27888) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_