CVE-2026-27026

ADVISORY - github

Summary

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used.

Patches

This has been fixed in pypdf==6.7.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3644.

Common Weakness Enumeration (CWE)

ADVISORY - github

CWE-770⁠

Allocation of Resources Without Limits or Throttling

Impacted images

Advisories

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