pypdf: Possible long runtimes/large memory usage when retrieving form fields
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document.
Patches
This has been fixed in pypdf==6.21.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4219.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pypdf | < 6.21.0 | 6.21.0 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7
- https://nvd.nist.gov/vuln/detail/CVE-2026-113789
- https://github.com/py-pdf/pypdf/pull/4219
- https://github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2
- https://github.com/py-pdf/pypdf
- https://github.com/py-pdf/pypdf/releases/tag/6.21.0
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-400, CWE-407- Platform
- Python (PyPI)
- Package
pypdf- Disclosed
- 22.10.2026
- Updated
- 22.10.2026 19:17
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6vvc-x485-93v7 - CC BY 4.0
Vulnerability history: pypdf
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 59
- First → latest
- 06.2023 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 10
- Medium 45
- Low 4
Disclosures per year
- 2023: 2
- 2024: 0
- 2025: 4
- 2026: 53
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