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Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

CVE-2026-59935pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)

High 8.7

In plain English

A high-severity infinite loop 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 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.6%top 50.1% 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 6.14.2, an attacker can craft a PDF with a page content stream containing a not terminated inline image that uses the ASCII85 or ASCIIHex filters, causing an infinite loop during parsing such as when extracting page text. This issue is fixed in version 6.14.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pypdfno fix listedDEBIAN-CVE-2026-59935
Debian:13pypdfno fix listedDEBIAN-CVE-2026-59935
Debian:14pypdf6.19.0-1DEBIAN-CVE-2026-59935
Debian:12pypdf2no fix listedDEBIAN-CVE-2026-59935
PyPIpypdf6.14.2GHSA-g867-7843-wf8q
PyPIpypdf6.14.2PYSEC-2026-3613
Ubuntu:24.04:LTSpypdfno fix listedUBUNTU-CVE-2026-59935
Ubuntu:25.10pypdfno fix listedUBUNTU-CVE-2026-59935
Ubuntu:26.04:LTSpypdfno fix listedUBUNTU-CVE-2026-59935
Ubuntu:26.10pypdfno fix listedUBUNTU-CVE-2026-59935
Ubuntu:22.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-59935
Ubuntu:24.04:LTSpypdf2no fix listedUBUNTU-CVE-2026-59935

Affected products (as reported)

VendorProductVersions
py-pdf pypdf < 6.14.2

Weakness: CWE-835 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References