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VULNERABILITIES

CVE-2026-27026 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016 [email protected]Patch
https://github.com/py-pdf/pypdf/pull/3644 [email protected]Issue TrackingPatch
https://github.com/py-pdf/pypdf/releases/tag/6.7.1 [email protected]ProductRelease Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h [email protected]PatchVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-770Allocation of Resources Without Limits or Throttling[email protected]

Affected Products

ProductVersions
pypdf project pypdf
< 6.7.1

CPE

  • cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-27026
NVD Published Date:
Feb 20, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-27026 Details - Not Deferred