PYSEC-2026-1837
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pypdf2/PYSEC-2026-1837.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-1837
- Aliases
- Published
- 2026-07-07T11:45:19.715500Z
- Modified
- 2026-07-07T17:46:59.524042100Z
- Severity
-
- 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- PyPDF2 quadratic runtime with malformed PDF missing xref marker
- Details
-
Impact
An attacker who uses this vulnerability can craft a PDF which leads to unexpected long runtime. This quadratic runtime blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage.
Patches
https://github.com/py-pdf/pypdf/pull/808
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
References
- References
-
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jrm6-h9cq-8gqw
- https://nvd.nist.gov/vuln/detail/CVE-2023-36810
- https://github.com/py-pdf/pypdf/issues/582
- https://github.com/py-pdf/pypdf/pull/808
- https://github.com/py-pdf/pypdf/commit/c6c56f550bb384e05f0139c796ba1308837d6373
- https://github.com/py-pdf/pypdf
- https://lists.debian.org/debian-lts-announce/2023/07/msg00019.html
- https://pypi.org/project/pypdf2
- https://github.com/advisories/GHSA-jrm6-h9cq-8gqw
Affected packages
PyPI / pypdf2
Package
- Name
- pypdf2
- View open source insights on deps.dev
- Purl
- pkg:pypi/pypdf2
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.27.9