PT-2026-44393 · Pypi · Pypdf

Sondt99 · Published 2026-05-28 · Updated 2026-06-12 · CVE-2026-48156

Positive Technologies (AI Summary)

CVSS v4.0

5.1

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions pypdf versions prior to 6.12.0

Description A flaw in the pure-python PDF library allows an attacker to craft a PDF file that causes long runtimes. This is achieved by using cross-reference streams with /W [0 0 0] values and large /Size values.

Recommendations Update to version 6.12.0.

Exploit

Fix

Weakness Enumeration

CWE-834

Related Identifiers

CVE-2026-48156

GHSA-248M-82V9-Q6G6

Affected Products

Pypdf

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48156.json · Exploit
• https://github.com/py-pdf/pypdf/pull/3791 · Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-48156 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-248m-82v9-q6g6 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-48156 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-48156 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-48156 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48156 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-48156 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-48156 · Vendor Advisory
• https://github.com/py-pdf/pypdf/releases/tag/6.12.0 · Note
• https://github.com/py-pdf/pypdf · Note
• https://github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70 · Note
• https://t.me/cveNotify/165260 · Telegram Post