Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function — CVE-2026-25833
MSRC · Microsoft · CVE-2026-25833
ID
CVE-2026-25833
CVE-2026-25833
Date
Activity
Source
MSRC
MSRC
Vendor
Microsoft
Microsoft
Threat
high
high
CVSS
7.5
7.5
Summary
CVE-2026-25833 is a advisory from MSRC. Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function Vendor: Microsoft. Severity/Threat: high.
Product
Security Update Guide
What to do
General, cautious steps (verify details in the official source):
- Prioritize patching or mitigation immediately (treat as actively risky).
- Identify affected product versions in your inventory and verify whether you are impacted.
- Apply vendor patches/updates or recommended mitigations as soon as available.
- Read the official advisory for exact affected versions and remediation steps.