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CVE-2026-28351

Manipulated RunLengthDecode streams can exhaust RAM

Published: Feb 27, 2026Updated: Mar 3, 2026 Sources: CVE List NVD GHSA BDUCWE-400
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 66.3%
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 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

pypdfpy-pdf
On-prem
OSS Libraries / pypi
pypdfpypdf project
Library
OSS Libraries / generic-library
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
PyPDFСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
pypdfPyPIOSS Libraries
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
pypdf projectoss-projectOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
pypipackage-ecosystemOSS Libraries

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-f2v5-7jq9-h8cg
github.com
https://github.com/py-pdf/pypdf/pull/3664
github.com
https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858
github.com
and 6 more references View all →

Timeline

Published
Feb 27, 2026
Last Updated
Mar 3, 2026

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