Resource exhaustion in Py-pdf Pypdf
CVE-2026-27888
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 t…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.003 (27.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Py-pdf Pypdf — versions < 6.7.3
- Pypdf_project Pypdf
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-27888?
- CVE-2026-27888 is a high-severity vulnerability in Py-pdf Pypdf, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-02-26.
- How severe is CVE-2026-27888?
- High severity. CVSS v3 base score is 7.5 out of 10.