CVE-2026-102995

high

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf

https://github.com/py-pdf/pypdf/releases/tag/6.18.1

https://github.com/py-pdf/pypdf/pull/4071

https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90367

Details

Source: Mitre, NVD

Published: 2026-09-30

Updated: 2026-10-01

Named Vulnerability: GHSA-fp3h-c4fm-7vvf

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00524