CVE-2026-45584

high

Published 2026-05-20 · Modified 2026-06-01

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CVSS v3

8.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.1

Description

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.

Predictions

Exploit likelihood

88%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Windows Affected 1 release

Version	Status	Fixed in
—	Affected	—

Application impact

Vendor	Product	Versions	Fixed
microsoft	malware_protection_engine	`{"startIncluding":"1.1.26030.3008","endExcluding":"1.1.26040.8"}`	`1.1.26040.8`

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584

CWEs

CWE-122

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.