What is CVE-2026-48155?

CVE-2026-48155 is a medium-severity vulnerability in Py-pdf Pypdf, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2026-05-28.

How severe is CVE-2026-48155?

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

Resource exhaustion in Py-pdf Pypdf

CVE-2026-48155

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets…

Vulnerability class: DoS (Denial of Service)

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 < 6.12.0
Pypdf_project Pypdf

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

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-2026-48155?: CVE-2026-48155 is a medium-severity vulnerability in Py-pdf Pypdf, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2026-05-28.
How severe is CVE-2026-48155?: Medium severity. CVSS v3 base score is 5.5 out of 10.