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CVE-2026-91809· NVD / CVE Program· CNA Foxit

Foxit PDF Editor/Reader Annotation Use-After-Free Information Disclosure Vulnerability

A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of malformed PDF form fields. Improper validation during field-name traversal may cause the application to access a released object, resulting in an application crash.

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
Sep 23, 2026
Updated
Sep 23, 2026
EPSS
0.1% · 1th percentile
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Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Foxit
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Foxit). Independent of NVD's CPE analysis and usually ahead of it.

  • Foxit Software Inc. Foxit PDF Editor

    • Versions 2026.2 and earlier, Versions 14.0.7 and earlier, Versions 13.2.6 and earlieraffected

  • Foxit Software Inc. Foxit PDF Reader

    • Versions 2026.2 and earlieraffected

Same product

foxit software inc.: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-91813Foxit PDF Editor/Reader FoxitUpdater Race Condition Local Privilege Escalation Vulnerability
    35Monitor
  • CVE-2026-91803Security Vulnerability Report – Foxit PDF Editor/Reader Updater DLL Search Path Hijacking
    35Monitor
  • CVE-2026-91800Foxit PDF Editor installer local privilege escalation
    35Monitor
  • CVE-2026-91798Foxit PDF Editor/Reader Updater Privilege Escalation
    35Monitor
  • CVE-2026-91818Foxit PDF Editor/Reader Annotation Use-After-Free Remote Code Execution Vulnerability
    31Monitor
  • CVE-2026-91816Foxit PDF Editor/Reader AcroForm Use-After-Free Remote Code Execution Vulnerability
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-917900 days apartFoxit PDF Editor/Reader Doc Object Use-After-Free Information Disclosure Vulnerability
    31Monitor
  • CVE-2026-917990 days apartFoxit Editor/Reader Array resetForm Use-After-Free Vulnerability
    31Monitor
  • CVE-2026-918050 days apartUse-after-free Vulnerability in Foxit PDF Editor/Reader Page-tree Handling
    31Monitor
  • CVE-2026-918060 days apartFoxit PDF Editor/Reader Doc Object Use-After-Free Information Disclosure Vulnerability
    31Monitor
  • CVE-2026-918160 days apartFoxit PDF Editor/Reader AcroForm Use-After-Free Remote Code Execution Vulnerability
    31Monitor
  • CVE-2026-918180 days apartFoxit PDF Editor/Reader Annotation Use-After-Free Remote Code Execution Vulnerability
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records