What is CVE-2026-48735?

CVE-2026-48735 is a medium-severity vulnerability in Py-pdf Pypdf, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.5/10. Published 2026-05-28.

How severe is CVE-2026-48735?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Resource exhaustion in Py-pdf Pypdf

CVE-2026-48735

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessar…

EPSS: 0.000 (1.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Py-pdf Pypdf — versions < 6.12.1
Pypdf_project Pypdf

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-48735?: CVE-2026-48735 is a medium-severity vulnerability in Py-pdf Pypdf, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.5/10. Published 2026-05-28.
How severe is CVE-2026-48735?: Medium severity. CVSS v3 base score is 5.5 out of 10.