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.
References
| Link | Resource |
|---|---|
| https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45 | Patch |
| https://github.com/py-pdf/pypdf/pull/3594 | Issue Tracking Patch |
| https://github.com/py-pdf/pypdf/releases/tag/6.6.0 | Release Notes |
| https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv | Vendor Advisory Mitigation |
Configurations
History
22 Jan 2026, 15:01
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45 - Patch | |
| References | () https://github.com/py-pdf/pypdf/pull/3594 - Issue Tracking, Patch | |
| References | () https://github.com/py-pdf/pypdf/releases/tag/6.6.0 - Release Notes | |
| References | () https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv - Vendor Advisory, Mitigation | |
| CPE | cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:* | |
| First Time |
Pypdf Project
Pypdf Project pypdf |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.3 |
10 Jan 2026, 05:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-10 05:16
Updated : 2026-01-22 15:01
NVD link : CVE-2026-22691
Mitre link : CVE-2026-22691
CVE.ORG link : CVE-2026-22691
JSON object : View
Products Affected
pypdf_project
- pypdf