pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Py-pdf
  • Pypdf
Pypdf Project
  • Pypdf

Configuration 1 [-]

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

No data.

References
Link Providers
https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858 cve-icon cve-icon cve-icon
https://github.com/py-pdf/pypdf/pull/3664 cve-icon cve-icon cve-icon
https://github.com/py-pdf/pypdf/releases/tag/6.7.4 cve-icon cve-icon cve-icon
https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-28351 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-28351 cve-icon
History

Tue, 03 Mar 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 03 Mar 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Pypdf Project
Pypdf Project pypdf
CPEs cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*
Vendors & Products Pypdf Project
Pypdf Project pypdf
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Tue, 03 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}

threat_severity

Moderate

Mon, 02 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Py-pdf
Py-pdf pypdf
Vendors & Products Py-pdf
Py-pdf pypdf

Fri, 27 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Description pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.
Title Manipulated RunLengthDecode streams can exhaust RAM
Weaknesses CWE-400
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-27T20:59:16.839Z

Updated: 2026-03-03T20:28:45.592Z

Reserved: 2026-02-26T18:38:13.890Z

Link: CVE-2026-28351

cve-icon Vulnrichment

Updated: 2026-03-03T20:28:41.738Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-27T21:16:19.177

Modified: 2026-03-03T18:36:06.290

Link: CVE-2026-28351

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-27T20:59:16Z

Links: CVE-2026-28351 - Bugzilla