CVE
A out-of-bounds write vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through…
- 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? →
- 39/100 · 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
A out-of-bounds write vulnerability in Fortinet FortiMail may allow a remote attacker, without logging in, to cause a denial of service by sending a specially crafted HTTP request.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
A out-of-bounds write vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow a remote unauthenticated attacker to cause a denial of service via a specially crafted HTTP request.
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)
- Severity7.5/10CVSS 7.5
- No patch0/5No signal
What would change the score
- Would score about 84 if added to CISA KEV
- Would score about 79 if CISA's SSVC rates exploitation active
- Would score about 44 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-2026-126154 (A out-of-bounds write vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through…), 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-2026-126154 (entry last updated 2026-11-11):
Affected:
- Fortinet FortiMail: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.6; from 7.4.0, through 7.4.8; from 7.2.0, through 7.2.9
Fixed versions: 8.0.2.
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-2026-126154 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126154 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-26-206
- https://www.cve.org/CVERecord?id=CVE-2026-126154
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-2026-126154
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-2026-126154"}.Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- Fortinet FortiMail
From 8.0.0 · through 8.0.1; From 7.6.0 · through 7.6.6; From 7.4.0 · through 7.4.8; From 7.2.0 · through 7.2.9
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-2026-126154
Is CVE-2026-126154 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?
A memory write goes past the bounds of its buffer when the FortiMail appliance handles a specially crafted HTTP request, which can crash it and cause a denial of service. The advisory describes the attack as remote and needing no login.Source: fortiguard.fortinet.com, cve.org
Which versions are affected by CVE-2026-126154?
FortiMail: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.6; from 7.4.0 through 7.4.8; from 7.2.0 through 7.2.9.Source: cve.now feed data
Am I affected, and how do I check?
FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.8, and 7.2.0 through 7.2.9 are listed as affected. Check the firmware version shown on the FortiMail admin dashboard or in the system status page to see which range a unit falls into.Source: fortiguard.fortinet.com, cve.org
How do I fix CVE-2026-126154?
Upgrade to FortiMail 8.0.2 or above, which the vendor lists as the fixed version.Source: fortiguard.fortinet.com, cve.org