CVE-2026-40260
MEDIUM5.3EPSS 0.02%pypdf: Manipulated XMP metadata entity declarations can exhaust RAM
Published: 4/10/2026Modified: 5/5/2026
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. ### Patches This has been fixed in [pypdf==6.10.0](https://github.com/py-pdf/pypdf/releases/tag/6.10.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3724](https://github.com/py-pdf/pypdf/pull/3724).
Affected packages (3)
- Debian/pypdffrom 0
- Debian/pypdf2from 0
- PyPI/pypdffrom 0, < 6.10.0
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-2026-40260
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-40260
- PATCHhttps://github.com/py-pdf/pypdf
- WEBhttps://github.com/py-pdf/pypdf/commit/b15a374e5ca648d4878e57c3b2c0551e7f8cc7f8
- WEBhttps://github.com/py-pdf/pypdf/pull/3724
- WEBhttps://github.com/py-pdf/pypdf/releases/tag/6.10.0
- WEBhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx