SB2026073128 - Multiple vulnerabilities in Go programming language

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Main Vulnerability Database SB2026073128

SB2026073128 - Multiple vulnerabilities in Go programming language

Published: July 31, 2026

Security Bulletin ID SB2026073128
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Information disclosure (CVE-ID: CVE-2026-42505)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper information exposure in crypto/tls when performing handshakes that use Encrypted Client Hello. A remote attacker can observe network traffic to disclose sensitive information.

The issue can de-anonymize handshakes by exposing pre-shared key identities in the unencrypted client hello.


2) Link following (CVE-ID: CVE-2026-39822)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to access files outside the intended root directory.

The vulnerability exists due to improper link resolution in os.Root file-opening functions when processing a path whose final component is a symbolic link and the path ends with a trailing slash. A local user can supply a crafted path to access files outside the intended root directory.

This issue affects Unix systems.


Remediation

Install update from vendor's website.

References