← Back to CVEs

CVE-2026-28351

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/27/2026

Last Modified3/3/2026

Sourcenvd

Honeypot Sightings0

Affected Products

pypdf_project:pypdf

Weaknesses (CWE)

CWE-400

References

https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858(security-advisories@github.com)

https://github.com/py-pdf/pypdf/pull/3664(security-advisories@github.com)

https://github.com/py-pdf/pypdf/releases/tag/6.7.4(security-advisories@github.com)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.