CVE-2026-59936Public exploitNetwork attack vector

Application hang via unterminated inline image

Published Jul 8, 2026 · Updated Jul 8, 2026

Denial of service in py-pdf pypdf before 6.14.1 allows remote attackers to hang PDF-processing applications with a crafted PDF. The ContentStream._read_inline_image method repeatedly calls read_non_whitespace at end of stream without testing for an empty token, so an unterminated inline-image dictionary never exits its parsing loop. Exploitation requires an application to parse an attacker-supplied page content stream, such as during text extraction, and consumes the processing thread without disclosing or changing data.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in py-pdf pypdf before 6.14.1 allows remote attackers to hang PDF-processing applications with a crafted PDF. The ContentStream._read_inline_image method repeatedly calls read_non_whitespace at end of stream without testing for an empty token, so an unterminated inline-image dictionary never exits its parsing loop. Exploitation requires an application to parse an attacker-supplied page content stream, such as during text extraction, and consumes the processing thread without disclosing or changing data.

The record

CVE
CVE-2026-59936
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
py-pdf
Product
pypdf
Classifications
CWE-400, CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.14.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

py-pdf · pypdfversion=< 6.14.1

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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