CVE-2026-28351 – Manipulated RunLengthDecode streams can exhaust RAM

CVE ID : CVE-2026-28351

Published : Feb. 27, 2026, 9:16 p.m. | 19 minutes ago

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.

Severity: 6.9 | MEDIUM

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