Is CVE-2026-33123 in the CISA KEV catalog?

No. CVE-2026-33123 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33123?

CVE-2026-33123 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-33123?

CVE-2026-33123 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33123?

Upgrade pypdf on debian unstable to 6.9.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-33123

MEDIUM

6.5

CVSS v3

NVD

Description

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.

CWE-400Resource Exhaustion CWE-407

How to fix

Remediation Available

pypdfDebian

Fixed in:6.9.2-1CVE-2026-33123

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch2

Release Notes1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-23.