CVE-2026-22690

pypdf has possible long runtimes for missing /Root object with large /Size values

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.

Scores

Weaknesses (CWE)

• CWE-400

Advisories

• GHSA-4xc4-762w-m6cg — pypdf has possible long runtimes for missing /Root object with large /Size values
• PYSEC-2026-1829 — pypdf has possible long runtimes for missing /Root object with large /Size values

European references

• ENISA EUVD · EUVD-2026-1692
• GCVE · GCVE-0-2026-22690

CERT-FR advisories

• CERTFR-2026-AVI-0627 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0224 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:* < 6.6.0

Affected products

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg
• https://github.com/py-pdf/pypdf/pull/3594
• https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45
• https://github.com/py-pdf/pypdf/releases/tag/6.6.0

Sources