GHSA-r2pg-r6h7-crf3

Source

https://github.com/advisories/GHSA-r2pg-r6h7-crf3

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-r2pg-r6h7-crf3/GHSA-r2pg-r6h7-crf3.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-r2pg-r6h7-crf3

Aliases

Downstream

CGA (36)

MINI (2)

Published

2026-04-13T16:36:36Z

Modified

2026-09-10T03:51:02Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

External Secrets Operator has DNS-based secret exfiltration via getHostByName in External Secrets v2 template engine

Details

Summary

The v2 template engine in runtime/template/v2/template.go imports Sprig’s TxtFuncMap() and removes env and expandenv, but leaves getHostByName available to user-controlled templates. Because ESO executes templates inside the controller process, an attacker who can create or update templated ExternalSecret resources can trigger controller-side DNS lookups using secret-derived values, creating a DNS exfiltration primitive.

Impact

This is a confidentiality issue. In environments where untrusted or lower-trust users can author templated ExternalSecret resources and the controller can perform DNS resolution, fetched secret material can be exfiltrated through DNS without requiring direct outbound access from the attacker’s workload.

Database specific

{
    "cwe_ids":  [
        "CWE-200"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-04-13T16:36:36Z",
    "nvd_published_at":  "2026-04-14T03:16:08Z",
    "severity":  "HIGH"
}

References

Affected packages

Go / github.com/external-secrets/external-secrets

Package

Name: github.com/external-secrets/external-secrets; View open source insights on deps.dev
Purl: pkg:golang/github.com/external-secrets/external-secrets

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.3.3-0.20260331202714-6800989bdc12

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-r2pg-r6h7-crf3/GHSA-r2pg-r6h7-crf3.json"

Go / github.com/external-secrets/external-secrets

Package

Name: github.com/external-secrets/external-secrets; View open source insights on deps.dev
Purl: pkg:golang/github.com/external-secrets/external-secrets

Affected ranges

Type: SEMVER
Events: Introduced

2.0.0

Last Affected

2.2.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-r2pg-r6h7-crf3/GHSA-r2pg-r6h7-crf3.json"