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.

NVD

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.

Exploitation:
NONE
Automatable:
YES
Technical Impact:
PARTIAL
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
NONE
Availability Impact:
NONE

Products Associated with CVE-2025-58189

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GoLang Go
Oracle

Affected Versions

Go standard library crypto/tls:

Exploit Probability

EPSS
0.47%
Percentile
41.02%

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.