Go TLS Conn.Handshake leaks attackersupplied ALPN data
CVE-2025-58189 Published on October 29, 2025
ALPN negotiation error contains attacker controlled information in crypto/tls
When Conn.Handshake fails during ALPN negotiation the error contains attacker controlled information (the ALPN protocols sent by the client) which is not escaped.
Vulnerability Analysis
CVE-2025-58189 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Products Associated with CVE-2025-58189
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Affected Versions
Go standard library crypto/tls:- Before 1.24.8 is affected.
- Version 1.25.0 and below 1.25.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.