HIGH 7.0 Microsoft
CVE-2026-63387
Libevent: Off-by-one stack buffer overflow in dnsname_to_labels via crafted DNS server response
Microsoft Security Update 2026-Aug: Libevent: Off-by-one stack buffer overflow in dnsname_to_labels via crafted DNS server response
Affected Products
- azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0
- azl3 libevent 2.1.12-1 on Azure Linux 3.0
- azl3 lldpd 1.0.22-1 on Azure Linux 3.0
- azl3 mysql 8.0.46-1 on Azure Linux 3.0
- azl3 ntp 4.2.8p17-2 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63387
- https://nvd.nist.gov/vuln/detail/CVE-2026-63387
This high severity vulnerability with a CVSS score of 7.0 was published on 2026-08-11 via Microsoft. Affected: azl3 fluent-bit 3.1.10-6 on Azure Linux 3.0, azl3 libevent 2.1.12-1 on Azure Linux 3.0, azl3 lldpd 1.0.22-1 on Azure Linux 3.0 and 2 more.
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