CVE-2026-119206 pypdf: Possible long runtimes when retrieving page labels
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119206?
CVE-2026-119206 is a high-severity vulnerability in py-pdf pypdf, published on 29 Oct 2026.
Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.
Weakness: CWE-400
Which versions are affected by CVE-2026-119206?
How do I fix CVE-2026-119206?
No fix has been published for CVE-2026-119206 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119206 being exploited?
There is no known exploitation of CVE-2026-119206 in the wild and no public exploit code.