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GHSA-5hgr-hg42-57jg

pypdf: Inefficient decoding of FlateDecode PNG predictor streams

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-49460

Packages

EcosystemPackageAffectedFixed in
PyPI pypdf < 6.12.2 6.12.2

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/FlateDecode` filter with a PNG predictor. ### 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 [#3806](https://github.com/py-pdf/pypdf/pull/3806).

References

External links from the advisory. They lead to third-party sites.