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CVE-2026-113794

pypdf: Possible infinite loop when hitting EOF in standard xref table

MEDIUM
6
CVSS Score
Published: October 21, 2026 at 03:59 PM UTC
Updated: October 28, 2026 at 02:17 AM UTC
1 product affected across 1 vendorPypdf

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Severity
MEDIUM6
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Pypdf· Py PDF
90%
v < 6.20.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

x_refsource_CONFIRM
Source: cverecord
https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/issues/4169
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/pull/4170
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/releases/tag/6.20.0

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMGitHub_M
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-835

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