HOMEVULNERABILITIESCVE-2026-33123
MEDIUM

CVE-2026-33123

CWE-400Published: March 20, 2026· Updated: Mar 23, 2026

6.5
CVSS v3.1
EPSS:0.00%probability of exploitation in 30 daysPercentile:0.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33123 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
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

Affected Vendors & Products

pypdf_project1 product
pypdf
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/py-pdf/pypdf/pull/3686
PATCHhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp

All References (3)

→
https://github.com/py-pdf/pypdf/pull/3686Issue Tracking · Patch
→
https://github.com/py-pdf/pypdf/releases/tag/6.9.1Product · Release Notes
→
https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcpPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2026-33123
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.00%
Affected1 vendor
PublishedMar 20, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2025-32422
8.7
CVE-2025-32424
8.7
CVE-2026-33155
8.7
CVE-2026-7790
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33123 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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