LOW 3.3 PyPI
pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams
GHSA-248m-82v9-q6g6 · CVE-2026-48156 · PYSEC-2026-3004
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Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values.
Patches
This has been fixed in pypdf==6.12.0.
Workarounds
If developers are unable to upgrade their apps immediately, they should consider applying the changes from PR #3791.
References
- WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-48156
- WEB https://github.com/py-pdf/pypdf/pull/3791
- WEB https://github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70
- PACKAGE https://github.com/py-pdf/pypdf
- WEB https://github.com/py-pdf/pypdf/releases/tag/6.12.0
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