CVE-2026-87993

Consul-template vulnerable to an information disclosure issue in error handling

Published Sep 10, 2026 CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed

Description

The consul-template library is vulnerable to an information disclosure issue in its error handling path that may allow Vault secret values to appear in template error messages, log output, and downstream surfaces such as Nomad task events. This vulnerability (CVE-2026-87993) is fixed in consul-template 0.43.0.

Analysis

Technical impact

The consul-template library contains an information disclosure flaw in its error handling path that can cause Vault secret values to be included in template error messages, log output, and downstream surfaces such as Nomad task events. This weakness, identified as CWE‑532, results in a confidentiality breach wherein sensitive secrets intended for secure storage may be inadvertently exposed to unintended recipients.

Affected Systems

The vulnerability affects the HashiCorp Consul‑Template tool. No specific affected versions are listed, but the issue is resolved in consul‑template version 0.43.0. Administrators should verify the version of consul‑template in use against this fixed release.

Risk and Exploitability

The CVSS score of 7.7 indicates a high severity impact. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector involves triggering error conditions during template processing, which would expose secret values via log files or event streams. No public exploitation is reported, but the potential for secret leakage warrants proactive remediation.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

HashiCorp

Tooling

unaffected

Version	Status	Constraints
`0.27.2`	affected	< 0.43.0

No data.

Vendor Product Versions

Hashicorp

Tooling

Version	Status	Scheme	Platform
`[0.27.2,0.43.0)`	affected	semver	['64_bit', '32_bit', 'x86', 'arm', 'macos', 'windows', 'linux']

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade consul‑template to version 0.43.0 or later to eliminate the flaw
Configure error logging to minimize exposure of secret data, e.g., disable verbose error details in the consul‑template configuration
Review and sanitize existing logs for accidental disclosure of Vault secrets

Generated by OpenCVE AI on September 10, 2026 at 22:31 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.377% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://discuss.hashicorp.com/t/hcsec-2026-38-consul-template-vulnerable-to-an-information-disclosure-issue-in-error-handling/77740

History

Sep 11, 2026 9:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Hashicorp Hashicorp tooling
Vendors & Products		Hashicorp Hashicorp tooling

Sep 10, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 10, 2026 7:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		The consul-template library is vulnerable to an information disclosure issue in its error handling path that may allow Vault secret values to appear in template error messages, log output, and downstream surfaces such as Nomad task events. This vulnerability (CVE-2026-87993) is fixed in consul-template 0.43.0.
Title		Consul-template vulnerable to an information disclosure issue in error handling
Weaknesses		CWE-532
References		https://discuss.hashicorp.com/t/hcsec-2026-38-consul-template-vulnerable-to-an-information-disclosure-issue-in-error-handling/77740
Metrics		cvssV3_1 `{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'}`