CVE-2026-27025
pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
- State
- Published
- Severity
- 6.9 Medium
- Published
- Feb 20, 2026
- Updated
- Feb 24, 2026
- Reserved
- Feb 17, 2026
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. This vulnerability is fixed in 6.7.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-834 Excessive Iteration
Affected Products
| Product | Versions |
|---|---|
pypdfpy-pdf |
|
References
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.