CVE
A out-of-bounds read vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4 all versions, FortiOS…
- Exploited
- No known exploitation
- Fix
- Fixed in 8.0.2
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 8.0.2.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 38/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Fortinet FortiOS has an out-of-bounds read flaw that lets an attacker reach the device remotely over the network, without logging in, and run arbitrary code or commands by sending crafted packets.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
A out-of-bounds read vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiOS 7.0 all versions may allow a remote privileged attacker to execute arbitrary code or command via crafted paquets.
Who should check
Teams running Fortinet FortiOS 8.0.0-8.0.1, 7.6.0-7.6.7, 7.4.0-7.4.12 or 7.2.0-7.2.13, and FortiSASE customers on listed versions.
Read the source excerpt
“An out-of-bounds read/write vulnerability (CWE-125/CWE-787) in FortiOS, FortiSASE, kernel”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach14/20Affects Fortinet (an enterprise product or network appliance)
- Severity7.4/10CVSS 7.4
- No patch0/5No signal
What would change the score
- Would score about 83 if added to CISA KEV
- Would score about 78 if CISA's SSVC rates exploitation active
- Would score about 43 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 8.0.2.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-126256 (A out-of-bounds read vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4 all versions, FortiOS…), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-126256 (entry last updated 2026-11-11):
Affected:
- Fortinet FortiOS: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.0, through 7.4.13; from 7.2.0, through 7.2.14; from 7.0.0, through 7.0.19
Fixed versions: 8.0.2.
Conditions (all must be true for the bug to be hit):
- Running an affected FortiOS version: 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.12, or 7.2.0 through 7.2.13. (source: https://fortiguard.fortinet.com/psirt/FG-IR-26-270)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
CISA KEV: CVE-2026-126256 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126256 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://fortiguard.fortinet.com/psirt/FG-IR-26-270
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-126256
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126256"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- Fortinet FortiOS
From 8.0.0 · through 8.0.1; From 7.6.0 · through 7.6.7; From 7.4.0 · through 7.4.13; From 7.2.0 · through 7.2.14; From 7.0.0 · through 7.0.19
Evidence 3
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-126256
Is CVE-2026-126256 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The flaw is an out-of-bounds read in FortiOS, where the software reads memory outside the area it should access. The impact listed is that an attacker can execute unauthorized code or commands.Source: fortiguard.fortinet.com
Which versions are affected by CVE-2026-126256?
FortiOS: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.7; from 7.4.0 through 7.4.13; from 7.2.0 through 7.2.14; from 7.0.0 through 7.0.19.Source: cve.now feed data
Am I affected, and how do I check?
The listed affected FortiOS versions are 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.12, and 7.2.0 through 7.2.13. Compare the FortiOS version installed on the device with these ranges.Source: fortiguard.fortinet.com
How do I fix CVE-2026-126256?
Upgrade to FortiOS 8.0.2 or above, which is the fixed version given in the checked facts.Source: fortiguard.fortinet.com