CVE-2026-25833

HIGHNVD 7.57.5—

7.5

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

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 17.1%
KEV: Not listed

Published

April 1, 2026

Last Modified

June 5, 2026

References (2)

Vendor Advisories for CVE-2026-25833(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-25833
Microsoft Security Response Center (MSRC)Medium
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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-121Stack-based Buffer Overflow

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2026-25833?

CVE-2026-25833 is a high vulnerability published on April 1, 2026. Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509inetpton_ipv6() function

When was CVE-2026-25833 disclosed?

CVE-2026-25833 was first published in the National Vulnerability Database on April 1, 2026, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-25833 actively exploited?

CVE-2026-25833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-25833?

CVE-2026-25833 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-25833?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-25833, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-25833

📅 Published

🔄 Last Modified

🔗 References (2)

📣 Vendor Advisories for CVE-2026-25833(1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)