Log in Start free

Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M

CVE-2026-119206pypdf: Possible long runtimes when retrieving page labels

High 7.1

In plain English

A high-severity uncontrolled resource consumption in pypdf from py-pdf. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High
Exploit odds (30 days)0.2%top 87.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pypdfno fix listedDEBIAN-CVE-2026-119206
Debian:13pypdfno fix listedDEBIAN-CVE-2026-119206
Debian:14pypdf6.21.4-1DEBIAN-CVE-2026-119206
Debian:12pypdf2no fix listedDEBIAN-CVE-2026-119206
PyPIpypdf6.21.3GHSA-42gh-23hr-vphw
Ubuntu:24.04:LTSpypdfno fix listedUBUNTU-CVE-2026-119206
Ubuntu:26.04:LTSpypdfno fix listedUBUNTU-CVE-2026-119206
Ubuntu:26.10pypdfno fix listedUBUNTU-CVE-2026-119206

Affected products (as reported)

VendorProductVersions
py-pdf pypdf < 6.21.3

Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References