High severity · published Sep 30, 2026
CVE-2026-102996
pypdf: Possible large memory usage when parsing font data
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.18.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102996
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102996
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q
x_refsource_MISC
https://github.com/py-pdf/pypdf/pull/4072
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.18.1
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