CVE-2026-91804

Code execution via malformed Circle annotation geometry

Published Sep 23, 2026 · Updated Sep 23, 2026

Heap-based out-of-bounds write in Foxit PDF Reader and PDF Editor 2026.2 and earlier allows attackers to execute code via a crafted PDF. The Circle-annotation renderer insufficiently validates Cloudy appearance-stream geometry before writing into a heap buffer, permitting memory corruption. Exploitation requires a Windows user to open the malicious document; successful handling can execute attacker-controlled code or crash the application.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based out-of-bounds write in Foxit PDF Reader and PDF Editor 2026.2 and earlier allows attackers to execute code via a crafted PDF. The Circle-annotation renderer insufficiently validates Cloudy appearance-stream geometry before writing into a heap buffer, permitting memory corruption. Exploitation requires a Windows user to open the malicious document; successful handling can execute attacker-controlled code or crash the application.

The record

CVE
CVE-2026-91804
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Foxit Software Company
Product
Foxit PDF Reader
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=Versions 2026.2 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Foxit Software Company · Foxit PDF Readerversion=Versions 2026.2 and earlier
Foxit Software Company · Foxit PDF Editorversion=Versions 13.2.6 and earlier; version=Versions 14.0.7 and earlier; version=Versions 2026.2 and earlier

Published CVSS scores

7.8Foxit SoftwareCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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