PYSEC-2026-4160
pypdf: Possible large memory usage when retrieving alphabetical page labels
At a glance
- Published
- Updated
- CVE
- CVE-2026-103000
- Aliases
- GHSA-w23x-9jrw-r45c
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large alphabetical labels. ### Patches This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4096](https://github.com/py-pdf/pypdf/pull/4096).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.19.0 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45c WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-103000 ADVISORY
- https://github.com/py-pdf/pypdf/pull/4096 WEB
- https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-w23x-9jrw-r45c ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |