Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
NVD Vulnerability Details :
CVE-2026-27026
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-20 Feb, 2026 | 22:16
Updated At-24 Feb, 2026 | 15:13

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.9MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.15.5MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 5.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CPE Matches
pypdf_project
pypdf_project
>>pypdf>>Versions before 6.7.1(exclusive)
cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-770Primarysecurity-advisories@github.com
CWE ID: CWE-770
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016security-advisories@github.com
Patch
https://github.com/py-pdf/pypdf/pull/3644security-advisories@github.com
Issue Tracking
Patch
https://github.com/py-pdf/pypdf/releases/tag/6.7.1security-advisories@github.com
Product
Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8hsecurity-advisories@github.com
Patch
Vendor Advisory
Hyperlink: https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/py-pdf/pypdf/pull/3644
Source: security-advisories@github.com
Resource:
Issue Tracking
Patch
Hyperlink: https://github.com/py-pdf/pypdf/releases/tag/6.7.1
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h
Source: security-advisories@github.com
Resource:
Patch
Vendor Advisory
Change History
0Changes found
Details not found