CVE-2026-91818
HIGH 7.8A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s JavaScript handling of PDF annotations. Reentrant page-event processing during annotation enumeration may release the associated page object, which is subsequently accessed, resulting in an application crash.
Severe if exploited (CVSS 7.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 1st percentile
Impact if exploited
7.8CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityHigh
What an attacker needs
- ⚠Access: Requires local access to the host
- ✓Privileges: No account or privileges required
- ⚠User interaction: A user must take an action (click / open a file)
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Affected
Vendors Foxit Software Inc. Foxit Microsoft
Products Foxit Pdf Editor Foxit Pdf Reader Pdf Editor Pdf Reader Windows
Weakness (CWE)
- CWE-416: Use After Free (CWE-416)
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Foxit | Pdf Editor | ≤ 13.2.5.63482 |
| Foxit | Pdf Editor | ≥ 14.0.0.33046 and ≤ 14.0.7.33751 |
| Foxit | Pdf Editor | ≥ 2023.1.0.15510 and ≤ 2023.3.0.23028 |
| Foxit | Pdf Editor | ≥ 2024.1.0.23997 and ≤ 2024.4.1.27687 |
| Foxit | Pdf Editor | ≥ 2025.1.0.27937 and ≤ 2025.3.0.35737 |
| Foxit | Pdf Editor | ≥ 2026.1.0.36452 and ≤ 2026.2.0.39747 |
| Foxit | Pdf Reader | ≤ 2026.2.0.39747 |
All CVSS metrics
- HIGH 7.8 v3.1 · CNA Primary
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - HIGH 7.8 v3.1 · NVD Secondary
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - MEDIUM 5.5 v3.1 · NVD Primary
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
Advisories
- https://www.foxit.com/support/security-bulletins.html CVE record · Foxit · Updated 2026-09-23T07:49:11.564Z
NVD · CVE-2026-91818 · Updated 2026-10-08T13:59:31.800 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-85156 EUVD · EUVD-2026-85156