Google Go up to 1.26.0 X.509 Certificate improper validation of specified index, position, or offset in input

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Google Go up to 1.26.0. Affected by this vulnerability is an unknown functionality of the component X.509 Certificate Handler. The manipulation results in improper validation of specified index, position, or offset in input. This vulnerability is reported as CVE-2026-27138. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Google Go up to 1.26.0. It has been classified as problematic. Affected is an unknown functionality of the component X.509 Certificate Handler. The manipulation with an unknown input leads to a improper validation of specified index, position, or offset in input vulnerability. CWE is classifying the issue as CWE-1285. The product receives input that is expected to specify an index, position, or offset into an indexable resource such as a buffer or file, but it does not validate or incorrectly validates that the specified index/position/offset has the required properties. This is going to have an impact on availability. CVE summarizes:

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

The advisory is available at groups.google.com. This vulnerability is traded as CVE-2026-27138 since 02/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 301390 (Linux Distros Unpatched Vulnerability : CVE-2026-27138), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.26.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (301390) and CERT Bund (WID-SEC-2026-0548). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Golang Go

Productinfo

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Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 5.9
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified index, position, or offset in input
CWE: CWE-1285
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 301390
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-27138

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Go 1.26.1

Timelineinfo

02/17/2026 CVE reserved
03/07/2026 +18 days Advisory disclosed
03/07/2026 +0 days VulDB entry created
04/01/2026 +25 days VulDB entry last update

Sourcesinfo

Vendor: google.com

Advisory: groups.google.com
Status: Confirmed

CVE: CVE-2026-27138 (🔒)
GCVE (CVE): GCVE-0-2026-27138
GCVE (VulDB): GCVE-100-349602
CERT Bund: WID-SEC-2026-0548 - Golang Go: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 03/07/2026 09:13
Updated: 04/01/2026 21:51
Changes: 03/07/2026 09:13 (54), 03/07/2026 14:58 (2), 03/12/2026 06:42 (12), 04/01/2026 21:51 (7)
Complete: 🔍
Cache ID: 216:14B:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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