CVE-2026-71852: pypdf is a free and open-source pure-python PDF library

Routine

LOW 3.3UPGRADE

CVE-2026-71852 is a low-severity flaw (CVSS 3.3) affecting pypdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extraction. This issue is fixed in 6.15.0.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-834
Published	2026-08-07
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc. · Vendor: pypdf project

Am I affected?

Timeline

2026-08-07 19:18 UTCPublished CVE record published
2026-10-23 20:10 UTCUpdated Record last modified

pypdf project pypdf UPGRADE

Affected: < 6.15.0

Fixed in: 6.15.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pypdf || rpm -q pypdf || pypdf --version

2. UPGRADE to 6.15.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pypdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pypdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

CVE-2026-71870 LOW 3.3 UPGRADE pypdf is a free and open-source pure-python PDF library

References

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