SB2026073125 - Multiple vulnerabilities in Go programming language

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Main Vulnerability Database SB2026073125

SB2026073125 - Multiple vulnerabilities in Go programming language

Published: July 31, 2026

Security Bulletin ID SB2026073125
CSH Severity
High
Patch available
YES
Number of vulnerabilities 9
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 11% Medium 56% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 9 vulnerabilities.


1) Resource exhaustion (CVE-ID: CVE-2026-32280)

CWE-ID: CWE-400 - Resource exhaustion

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the Certificate.Verify chain-building logic in crypto/x509 when processing a large number of intermediate certificates supplied through VerifyOptions.Intermediates. A remote attacker can provide a large number of intermediate certificates to cause a denial of service.

This affects both direct users of crypto/x509 and users of crypto/tls.


2) Input validation error (CVE-ID: CVE-2026-32281)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in Certificate.Verify in crypto/x509 when validating certificate chains containing a very large number of policy mappings. A remote attacker can present a specially crafted certificate chain to cause a denial of service.

This only affects validation of otherwise trusted certificate chains issued by a root CA in the VerifyOptions.Roots CertPool or in the system certificate pool.


3) Protection mechanism failure (CVE-ID: CVE-2026-27140)

CWE-ID: CWE-693 - Protection Mechanism Failure

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


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a trust layer bypass in cmd/go when processing SWIG file names containing 'cgo' and crafted payloads at build time. A remote attacker can supply a specially crafted SWIG file to execute arbitrary code.


4) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-32288)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled memory allocation in archive/tar Reader.Next when parsing a maliciously crafted tar archive containing a large number of sparse regions encoded in the old GNU sparse map format. A remote attacker can supply a specially crafted archive to cause a denial of service.


5) Integer overflow (CVE-ID: CVE-2026-27143)

CWE-ID: CWE-190 - Integer overflow

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


The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to integer overflow in cmd/compile when optimizing arithmetic over induction variables in loops. A local user can compile specially crafted code to cause memory corruption.

The issue can result in invalid indexing at runtime.


6) Buffer overflow (CVE-ID: CVE-2026-27144)

CWE-ID: CWE-119 - Memory corruption

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


The vulnerability allows a local user to cause memory corruption at runtime.

The vulnerability exists due to memory corruption in cmd/compile when compiling code involving a no-op interface conversion on pointers used as operands of a memory move. A local user can compile specially crafted code to cause memory corruption at runtime.


7) Improper Certificate Validation (CVE-ID: CVE-2026-33810)

CWE-ID: CWE-295 - Improper Certificate Validation

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


The vulnerability allows a remote attacker to bypass certificate name constraints.

The vulnerability exists due to improper certificate validation in the Certificate.Verify function in crypto/x509 when verifying a certificate chain containing excluded DNS constraints and wildcard DNS SANs that use different letter case than the constraint. A remote attacker can present a specially crafted certificate chain to bypass certificate name constraints.

This only affects validation of otherwise trusted certificate chains issued by a root CA in the VerifyOptions.Roots CertPool or in the system certificate pool.


8) Cross-site scripting (CVE-ID: CVE-2026-32289)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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


The vulnerability allows a remote attacker to inject arbitrary script code.

The vulnerability exists due to improper neutralization of input during web page generation in html/template when processing template actions within JavaScript template literals. A remote attacker can supply crafted input that is incorrectly escaped to inject arbitrary script code.

Exploitation requires templates that use branches or actions within JavaScript template literals.


9) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-32282)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

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


The vulnerability allows a local user to modify file permissions outside the intended root directory.

The vulnerability exists due to improper access control in Root.Chmod and internal/syscall/unix Fchmodat when handling a chmod operation on Linux. A local user can replace the target with a symlink during the check-and-operation window to modify file permissions outside the intended root directory.

Exploitation requires a race condition in which the target is swapped with a symlink while the chmod operation is in progress.


Remediation

Install update from vendor's website.

References