PYSEC-2026-3020
pypdf: Possible large memory usage for form XObjects during text extraction
At a glance
- Published
- Updated
- CVE
- CVE-2026-49461
- Aliases
- GHSA-j543-4vmf-qm7v
- CVSS_V4
- CVSS:4.0/AV:L/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 usage. This requires extracting the text of a page which contains a form XObject with self-references. ### Patches This has been fixed in [pypdf==6.12.2](https://github.com/py-pdf/pypdf/releases/tag/6.12.2). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3805](https://github.com/py-pdf/pypdf/pull/3805).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.12.2 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-j543-4vmf-qm7v WEB
- https://github.com/py-pdf/pypdf/pull/3805 WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.12.2 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-j543-4vmf-qm7v ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-49461 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |