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OpenAdvisories
Medium · 4.6 CVE-2026-33699 EUVD-2026-16496GHSA-87mj-5ggw-8qc3PYSEC-2026-3012

pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Published Mar 26, 2026 · Updated Mar 27, 2026 · Assigned by GitHub_M

Description

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

Affected products

VendorProductAffectedFixed
py-pdf pypdf < 6.9.2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 pypdf 6.9.2-1 —
Debian 13 pypdf No fix yet —
Debian 12 pypdf +1 No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.04 LTS pypdf No fix yet —
Ubuntu 25.10 pypdf No fix yet —
Ubuntu 24.04 LTS pypdf +1 No fix yet —
Ubuntu 22.04 LTS pypdf2 No fix yet —
Ubuntu 20.04 LTS pypdf2 No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 18.04 LTS pypdf2 No fix yet —
Ubuntu Pro 16.04 LTS pypdf2 No fix yet —
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed python-pypdf 6.9.2-1.1 openSUSE-SU-2026:10464-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling open-webui 0.8.12-r1 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI pypdf < 6.9.2 6.9.2 GHSA-87mj-5ggw-8qc3

Advisories 1

References