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CVE-2026-28804

pypdf: Inefficient decoding of ASCIIHexDecode streams

Published: Mar 6, 2026Updated: Mar 6, 2026 Sources: CVE List NVD GHSA BDUCWE-407
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 68.5%
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 version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.

CVSS Vector Breakdown

AV:NAC:LC:NI:NA:L
Exploitability
AV:NAccess Vector
Network
AC:LAccess Complexity
Low
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
L
Open in CVSS calculator →

Weaknesses

CWE-407

Affected Products

pypdfpy-pdf
On-prem
OSS Libraries / pypi
pypdfPyPIOSS Libraries
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
PyPDF2Matthew Peveler
Library
OSS Libraries
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
pypipackage-ecosystemOSS Libraries
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/security/advisories/GHSA-9m86-7pmv-2852
github.com
https://github.com/py-pdf/pypdf/pull/3666
github.com
https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f
github.com
and 9 more references View all →

Timeline

Published
Mar 6, 2026
Last Updated
Mar 6, 2026

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