CVE-2026-25833
Analyzed Analyzed - Analysis Complete
Buffer Overflow in Mbed TLS x509_inet_pton_ipv6 Function

Publication date: 2026-04-01

Last updated on: 2026-06-05

Assigner: MITRE

Description
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 Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-04-01
Last Modified
2026-06-05
Generated
2026-06-16
AI Q&A
2026-04-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25833
EUVD
EUVD-2026-17997
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
trustedfirmware mbed_tls 4.0.0
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

CVE-2026-25833 is a buffer underflow vulnerability in the function x509_inet_pton_ipv6() within Mbed TLS. This issue arises due to improper handling of input data when parsing IPv6 addresses in X.509 certificates, leading to a buffer underflow condition.

The vulnerability can potentially cause memory safety issues such as crashes or arbitrary code execution.

Impact Analysis

This vulnerability can lead to serious memory safety issues including application crashes or even arbitrary code execution, which could allow an attacker to take control of the affected system or cause denial of service.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Mbed TLS to version 3.6.6 or later, or to version 4.1.0 or later, where the buffer overflow in the x509_inet_pton_ipv6() function has been fixed.

Compliance Impact

The provided information does not specify how the buffer underflow vulnerability in Mbed TLS affects compliance with common standards and regulations such as GDPR or HIPAA.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-25833. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart