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Vulnerability record · CVE-2026-91817 · published 23 September 2026

CVE-2026-91817: Foxit pdf editor out-of-bounds read vulnerability

Foxit · Pdf Editor

A heap-based out-of-bounds read vulnerability exists in Foxit PDF Editor/Reader’s handling of wide strings in embedded PDF JavaScript. Insufficient validation of string-deletion ranges can cause an integer underflow, resulting in an out-of-bounds read and application crash.

6.1 CVSS 3.1 Medium EPSS 0.11% · top 99.0% CWE-125 · Out-of-bounds read
6.1CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
1References
1 Oct 2026Last modified by NVD

Description

A heap-based out-of-bounds read vulnerability exists in Foxit PDF Editor/Reader’s handling of wide strings in embedded PDF JavaScript. Insufficient validation of string-deletion ranges can cause an integer underflow, resulting in an out-of-bounds read and application crash.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.foxit.com/support/security-bulletins.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-91817), CISA KEV, FIRST EPSS (scores of 2026-10-04). This page is refreshed as NVD updates the record.