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CVE Vulnerability Details :
CVE-2026-27026
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-20 Feb, 2026 | 21:12
Updated At-24 Feb, 2026 | 18:47
Rejected At-
▼CVE Numbering Authority (CNA)
pypdf possibly has long runtimes for malformed FlateDecode streams

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. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

Affected Products
Vendor
py-pdf
Product
pypdf
Versions
Affected
  • < 6.7.1
Problem Types
TypeCWE IDDescription
CWECWE-770CWE-770: Allocation of Resources Without Limits or Throttling
Type: CWE
CWE ID: CWE-770
Description: CWE-770: Allocation of Resources Without Limits or Throttling
Metrics
VersionBase scoreBase severityVector
4.06.9MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Version: 4.0
Base score: 6.9
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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-9mvc-8737-8j8h
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/3644
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.7.1
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/py-pdf/pypdf/pull/3644
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/releases/tag/6.7.1
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