CVE-2025-65318: When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file sy

Q: How do I fix CVE-2025-65318?

canary mail: upgrade to newer than 5.1.40. Exact commands for each OS are on this page.

Q: Is CVE-2025-65318 being exploited?

CVE-2025-65318 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65318 affect?

CVE-2025-65318 affects canary mail. Severity is critical (CVSS 9.1). When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file system without a Mark-of-the-Web tag, which allows attackers to bypass the built-in file protection mechanisms of both Windows OS an

Q: How urgent is CVE-2025-65318?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-65318 is a critical-severity flaw (CVSS 9.1) affecting canary mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file system without a Mark-of-the-Web tag, which allows attackers to bypass the built-in file protection mechanisms of both Windows OS and third-party software.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-693
Published	2025-12-16
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: canarymail

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-16 16:15 UTCPublished CVE record published
2026-07-05 17:17 UTCUpdated Record last modified

canarymail canary mail UPGRADE

Affected: <= 5.1.40

Fixed in: newer than 5.1.40

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy canary-mail || rpm -q canary-mail || canary-mail --version

2. UPGRADE to newer than 5.1.40 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade canary-mail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade canary-mail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65318?

canary mail: upgrade to newer than 5.1.40. Exact commands for each OS are on this page.

Is CVE-2025-65318 being exploited?

CVE-2025-65318 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65318 affect?

CVE-2025-65318 affects canary mail. Severity is critical (CVSS 9.1). When using the attachment interaction functionality, Canary Mail 5.1.40 and below saves documents to a file system without a Mark-of-the-Web tag, which allows attackers to bypass the built-in file protection mechanisms of both Windows OS an

How urgent is CVE-2025-65318?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

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References

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