CVE-2026-115580: pypdf is a free and open-source pure-python PDF library

Routine

HIGH 7.1

CVE-2026-115580 is a high-severity flaw (CVSS 7.1) affecting affected software. 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 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Passive
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-834
Published	2026-10-23
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-23 20:17 UTCPublished CVE record published
2026-10-23 20:17 UTCUpdated Record last modified

Exact fixes by distribution

Python (pip) · pypdf · FIXED · 6.21.2 · vulnerable: < 6.21.2 · source

pip install --upgrade "pypdf>=6.21.2" pip show pypdf

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

RHEL AI (RHEL AI) 3 · rhelai3/bootc-cuda-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-gaudi-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-rocm-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/disk-image-cuda-rhel9 · DEFERRED

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.

Quick answers

How do I fix CVE-2026-115580?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-115580 being exploited?

CVE-2026-115580 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-115580 affect?

CVE-2026-115580 affects affected software. Severity is high (CVSS 7.1). pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long

How urgent is CVE-2026-115580?

Priority 36/100. High severity

Software pages

Python vulnerabilities

References

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