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CVE Vulnerability Details :
CVE-2026-27888
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-26 Feb, 2026 | 00:42
Updated At-26 Feb, 2026 | 16:16
Rejected At-
▼CVE Numbering Authority (CNA)
pypdf: Manipulated FlateDecode XFA streams can exhaust RAM

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.

Affected Products
Vendor
py-pdf
Product
pypdf
Versions
Affected
  • < 6.7.3
Problem Types
TypeCWE IDDescription
CWECWE-400CWE-400: Uncontrolled Resource Consumption
Type: CWE
CWE ID: CWE-400
Description: CWE-400: Uncontrolled Resource Consumption
Metrics
VersionBase scoreBase severityVector
4.06.6MEDIUM
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/E:U
Version: 4.0
Base score: 6.6
Base severity: MEDIUM
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/E:U
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/3658
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.7.3
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/py-pdf/pypdf/pull/3658
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/releases/tag/6.7.3
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found