PT-2026-32690 · Fortinet · Fortiweb

CVE-2026-39811 · Published 2026-04-14 · Updated 2026-04-19

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions FortiWeb versions 8.0.0 through 8.0.3 FortiWeb versions 7.6.0 through 7.6.6 FortiWeb versions 7.4 (affected versions not specified) FortiWeb versions 7.2 (affected versions not specified) FortiWeb versions 7.0 (affected versions not specified)

Description An integer overflow or wraparound issue exists in the cgi buf alloc function, which could allow an attacker to cause a denial of service.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

BDU:2026-06111

CVE-2026-39811

ZDI-26-265

Affected Products

Fortiweb

References · 5

• https://zerodayinitiative.com/advisories/ZDI-26-265 · Security Note
• https://fortiguard.fortinet.com/psirt/FG-IR-26-108 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-39811 · Security Note
• https://bdu.fstec.ru/vul/2026-06111 · Security Note
• https://twitter.com/CVEnew/status/2045889768236388473 · Twitter Post