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Database

Improper resource allocation In pypdf

Description

pypdf: Possible large memory usage for large /ToUnicode streams

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction.

Patches

This has been fixed in pypdf==6.15.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3944.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem
Component
Affected version
Patched versions

Aliases

1. CVE-2026-718702. NVD-2026-718703. OSV-2026-718704. GHSA-fp3f-mc75-235c5. GCVE-2026-71870

References

1. https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c2. https://github.com/py-pdf/pypdf/pull/39443. https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa4. https://github.com/py-pdf/pypdf/releases/tag/6.15.0

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