HOMEVULNERABILITIESCVE-2026-41313
MEDIUM

CVE-2026-41313

CWE-834Published: April 22, 2026· Updated: Apr 27, 2026

6.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.5th

Official Description

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

NVD Source

Technical Analysis

CVE-2026-41313 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/commit/c50a0104cf083356f7c7f5d61410466a57f5c88a
PATCHhttps://github.com/py-pdf/pypdf/pull/3735
PATCHhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcw

All References (4)

→
https://github.com/py-pdf/pypdf/commit/c50a0104cf083356f7c7f5d61410466a57f5c88aPatch
→
https://github.com/py-pdf/pypdf/pull/3735Issue Tracking · Patch
→
https://github.com/py-pdf/pypdf/releases/tag/6.10.2Release Notes
→
https://github.com/py-pdf/pypdf/security/advisories/GHSA-4pxv-j86v-mhcwPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2026-41313
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-834
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 22, 2026

Related CVEs (CWE-834)

CVE-2026-27025
5.5
CVE-2026-41168
5.3
CVE-2026-48156
3.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-41313 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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