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CVE Vulnerability Details :
CVE-2026-27025
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 | 21:11
Updated At-24 Feb, 2026 | 18:40
Rejected At-
▼CVE Numbering Authority (CNA)
pypdf has possible long runtimes/large memory usage for large /ToUnicode 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 and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. 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-834CWE-834: Excessive Iteration
Type: CWE
CWE ID: CWE-834
Description: CWE-834: Excessive Iteration
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-wgvp-vg3v-2xq3
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/3646
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
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-wgvp-vg3v-2xq3
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/py-pdf/pypdf/pull/3646
Resource:
x_refsource_MISC
Hyperlink: https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
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