AI and data stack advisories

Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-55007

Microsoft Exchange Server: double free

Microsoft

CVE-2026-55007 · Published Sep 8, 2026 · updated Oct 5, 2026

High8.1
Fix: upgrade to 15.02.1544.046 or later (3 fixed versions below)
Microsoft advisory

Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

Affected versions

PackageAffectedFixed in
Microsoft Exchange Server 2019 Cumulative Update 14
Product
>= 15.02.0.0, < 15.02.1544.04615.02.1544.046
Microsoft Exchange Server 2019 Cumulative Update 15
Product
>= 15.02.0.0, < 15.02.1748.05115.02.1748.051
Microsoft Exchange Server Subscription Edition RTM
Product
>= 15.02.0.0, < 15.02.2562.04915.02.2562.049
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-415

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