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CVE-2026-27888

pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

Published: Feb 26, 2026Updated: Feb 27, 2026 Sources: CVE List NVD GHSA BDUCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 73.6%
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 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
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:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

pypdfpy-pdf
On-prem
OSS Libraries / pypi
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
PyPDFСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
pypdfpypdf project
Library
OSS Libraries / generic-library
pypdfPyPIOSS Libraries
py-pdfpackage-ecosystemOSS Librariesaka pypdf, pypdf2
ооо «ред софт»commercialRUOperating Systemsaka red soft
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
pypdf projectoss-projectOSS Libraries
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-x7hp-r3qg-r3cj
github.com
https://github.com/py-pdf/pypdf/pull/3658
github.com
https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
github.com
and 5 more references View all →

Timeline

Published
Feb 26, 2026
Last Updated
Feb 27, 2026

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