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CVE-2026-27025

pypdf has possible long runtimes/large memory usage for large /ToUnicode streams

Published: Feb 20, 2026Updated: Feb 24, 2026 Sources: CVE List NVD GHSA BDUCWE-834
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
0.2%
Top 93.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-834

Affected Products

pypdfpypdf project
Library
OSS Libraries / generic-library
pypdfPyPIOSS Libraries
pypdfpy-pdf
On-prem
OSS Libraries / pypi
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
PyPDF2Matthew Peveler
Library
OSS Libraries
pypdf projectoss-projectOSS Libraries
pypipackage-ecosystemOSS Libraries
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
ооо «ред софт»commercialRUOperating Systemsaka red soft
matthew pevelerOSS Librariesaka pypdf2

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
github.com
https://github.com/py-pdf/pypdf/pull/3646
github.com
https://github.com/py-pdf/pypdf/releases/tag/6.7.1
github.com
and 9 more references View all →

Timeline

Published
Feb 20, 2026
Last Updated
Feb 24, 2026

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