CVE-2026-28351
MEDIUM5.3EPSS 0.02%pypdf: Manipulated RunLengthDecode streams can exhaust RAM
Published: 2/28/2026Modified: 4/28/2026
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.
Affected packages (3)
- Debian/pypdffrom 0
- Debian/pypdf2from 0
- PyPI/pypdffrom 0, < 6.7.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-28351
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-28351
- PATCHhttps://github.com/py-pdf/pypdf
- WEBhttps://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858
- WEBhttps://github.com/py-pdf/pypdf/pull/3664
- WEBhttps://github.com/py-pdf/pypdf/releases/tag/6.7.4
- WEBhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg