In short
- CVE-2026-102996 is a HIGH (CVSS 7.5) vulnerability affecting pypdf, pypdf (pypdf project).
- Chance of exploitation in the next 30 days (EPSS): 0.34%, higher than 27.6% of all vulnerabilities.
- Fix: update to 6.18.1 or later.
| Package | Affected versions | Patched versions |
|---|
| pypdf PyPI | < 6.18.1
| 6.18.1
|
| pypdf | < 6.18.1
| 6.18.1
|
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /Widths entry of a TrueType or Type1 fonts with unusually large values, for example during text extraction.
Patches
This has been fixed in pypdf==6.18.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4072.
NVD description
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. This issue is fixed in version 6.18.1.
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