html-template up to 1.25.9/1.26.2 on Go Type escape output

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in html-template up to 1.25.9/1.26.2 on Go. It has been classified as critical. This vulnerability affects unknown code. Performing a manipulation of the argument Type results in escape output. This vulnerability is reported as CVE-2026-39826. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in html-template up to 1.25.9/1.26.2 on Go. This affects an unknown code block. The manipulation of the argument type with an unknown input leads to a escape output vulnerability. CWE is classifying the issue as CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

If a trusted template author were to write a tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the block.

It is possible to read the advisory at go.dev. This vulnerability is uniquely identified as CVE-2026-39826 since 04/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 313236 (Linux Distros Unpatched Vulnerability : CVE-2026-39826), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.10 or 1.26.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202605-1458), Tenable (313236), EUVD (EUVD-2026-28426) and CERT Bund (WID-SEC-2026-1437). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Splunk Splunk Enterprise
  • Red Hat Enterprise Linux
  • Google Container-Optimized OS
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Golang Go
  • Red Hat OpenShift

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Escape output
CWE: CWE-116 / CWE-74 / CWE-707
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: 313236
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-39826

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: html-template 1.25.10/1.26.3

Timelineinfo

04/07/2026 CVE reserved
05/07/2026 +30 days Advisory disclosed
05/07/2026 +0 days VulDB entry created
07/20/2026 +74 days VulDB entry last update

Sourcesinfo

Advisory: go.dev
Status: Confirmed

CVE: CVE-2026-39826 (🔒)
GCVE (CVE): GCVE-0-2026-39826
GCVE (VulDB): GCVE-100-361947
EUVD: 🔒
CERT Bund: WID-SEC-2026-1437 - Golang Go: Mehrere Schwachstellen
CNNVD: CNNVD-202605-1458 - Google Go 安全漏洞

Entryinfo

Created: 05/07/2026 22:32
Updated: 07/20/2026 14:06
Changes: 05/07/2026 22:32 (53), 05/08/2026 02:32 (1), 05/08/2026 19:04 (6), 05/09/2026 01:00 (7), 05/09/2026 04:56 (2), 06/19/2026 18:24 (1), 07/20/2026 14:06 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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