What is CVE-2025-66382?

CVE-2025-66382 is a security advisory published by Microsoft Security Response Center (MSRC) with Low severity. In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.

Which CVE IDs does CVE-2025-66382 cover?

CVE-2025-66382 covers the following CVE IDs: CVE-2025-66382. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-66382?

CVE-2025-66382 has a CVSS v3 base score of 2.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-66382?

CVE-2025-66382 affects 8 products, including: azl3 expat 2.6.4-2 on Azure Linux 3.0; azl3 expat 2.6.4-4 on Azure Linux 3.0; azl3 expat 2.6.4-5 on Azure Linux 3.0; azl3 expat 2.6.4-6 on Azure Linux 3.0; cbl2 expat 2.6.4-2 on CBL Mariner 2.0; and others — see the full list on the advisory page.

CVE-2025-66382LowCVSS 2.9

In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-66382 →

🎯 Affected products8

azl3 expat 2.6.4-2 on Azure Linux 3.0
azl3 expat 2.6.4-4 on Azure Linux 3.0
azl3 expat 2.6.4-5 on Azure Linux 3.0
azl3 expat 2.6.4-6 on Azure Linux 3.0
cbl2 expat 2.6.4-2 on CBL Mariner 2.0
cbl2 expat 2.6.4-3 on CBL Mariner 2.0
cbl2 expat 2.6.4-4 on CBL Mariner 2.0
cbl2 expat 2.6.4-4 on CBL-Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 2.8.2-1 KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-66382
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade