CVE-2026-34984

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{"affected": [{"affectedData": [{"product": "external-secrets", "vendor": "external-secrets", "versions": [{"status": "affected", "version": "< 2.3.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:external-secrets:external_secrets_operator:*:*:*:*:*:*:*:*", "matchCriteriaId": "574887EB-4DA9-4266-9ABE-DA1209F8A935", "versionEndExcluding": "2.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Versions 2.2.0 and below contain a vulnerability in runtime/template/v2/template.go where the v2 template engine removes env and expandenv from Sprig's TxtFuncMap() but leaves the getHostByName function accessible to user-controlled templates. Since ESO executes templates within the controller process, an attacker who can create or update templated ExternalSecret resources can invoke controller-side DNS lookups using secret-derived values. This creates a DNS exfiltration primitive, allowing fetched secret material to be leaked via DNS queries without requiring direct outbound network access from the attacker's workload. The impact is a confidentiality issue, particularly in environments where untrusted or lower-trust users can author templated ExternalSecret resources and the controller has DNS resolution capability. This issue has been fixed in version 2.3.0."}], "id": "CVE-2026-34984", "lastModified": "2026-06-17T10:39:56.500", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34984", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-14T15:37:48.338681Z", "version": "2.0.3"}}]}, "published": "2026-04-14T03:16:08.530", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/external-secrets/external-secrets/commit/6800989bdc12782ca2605d3b8bf7f2876a16551a"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/external-secrets/external-secrets/releases/tag/v2.3.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/external-secrets/external-secrets/security/advisories/GHSA-r2pg-r6h7-crf3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "External Secrets Operator: github.com/external-secrets/external-secrets: External Secrets Operator: Information disclosure via DNS exfiltration in v2 template engine", "id": "2458129", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458129"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-94", "details": ["A flaw was found in External Secrets Operator. An attacker with the ability to create or update templated ExternalSecret resources can exploit a vulnerability in the v2 template engine. This flaw allows the attacker to use the getHostByName function to perform controller-side DNS lookups, leading to the exfiltration of sensitive secret material through DNS queries. This results in a confidentiality issue, as secret data can be leaked without requiring direct outbound network access from the attacker's workload."], "name": "CVE-2026-34984", "package_state": [{"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/bitwarden-sdk-server-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-operator-bundle", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-operator-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}], "public_date": "2026-04-14T01:48:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34984\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34984\nhttps://github.com/external-secrets/external-secrets/commit/6800989bdc12782ca2605d3b8bf7f2876a16551a\nhttps://github.com/external-secrets/external-secrets/releases/tag/v2.3.0\nhttps://github.com/external-secrets/external-secrets/security/advisories/GHSA-r2pg-r6h7-crf3"], "statement": "An attacker with permissions to create or update templated ExternalSecret resources in External Secrets Operator for Red Hat OpenShift can exploit a flaw in the v2 template engine. This allows for information disclosure of sensitive secret material through DNS exfiltration, particularly in environments where untrusted users can define templated ExternalSecret resources and the controller has DNS resolution capabilities. Red Hat Product Security team has rated this vulnerability as having the impact of Moderate as the attacker has to have privileges to exploit this vulnerability.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.3.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "external-secrets", "source": "cna", "vendor": "external-secrets"}, "product": "external-secrets", "vendor": "external-secrets"}], "analysis": {"en": {"generated_at": "2026-04-27T19:56:33.830122+00:00", "value": {"mitigation_remediation": ["Upgrade External Secrets Operator to v2.3.0 or later", "Restrict RBAC so that only trusted users can create or update templated ExternalSecret resources", "Monitor DNS traffic from the External Secrets controller for unexpected lookups and review logs for anomalies"], "summary": {"action": "Apply Patch", "impact": "Confidentiality breach via DNS exfiltration"}, "threat_synthesis": {"affected_systems": "The issue affects the External Secrets Operator, specifically the external\u2011secrets:external\u2011secrets product. All releases up to and including 2.2.0 are vulnerable; the problem was resolved in version 2.3.0. Further version details are not provided beyond this upgrade point.", "description_and_impact": "The vulnerability is caused by a remnant getHostByName function in the External Secrets Operator\u2019s v2 template engine. Templates that administrators or authorized users create are executed inside the controller process, giving any attacker who can add or modify a templated ExternalSecret the ability to trigger DNS lookups. The attacker can embed secret\u2011derived data into the lookup target, causing the controller to query an external DNS server and thereby exfiltrate sensitive secret material. The core weakness aligns with the confidentiality category of this CVE and is identified as CWE\u2011200 and CWE\u201194; the CVE record also lists NVD\u2011CWE\u2011noinfo, indicating no additional standard CWE classification.", "risk_and_exploitability": "With a CVSS score of 7.1, the risk is considered moderate to high. The EPSS score of 0.00044 indicates a very low, but non\u2011zero, probability of exploitation, and the vulnerability is not listed in the CISA KEV catalog. If the attacker has permission to create or update templated ExternalSecret objects, DNS exfiltration can occur even when the attacker\u2019s workload lacks outbound network connectivity, marking it a significant confidentiality threat in environments with less trusted users or unrestricted templated secret creation."}}}}, "created": "2026-04-14T16:16:05.351694+00:00", "updated": "2026-04-27T20:00:05.660618+00:00", "vendors": ["external-secrets", "external-secrets$PRODUCT$external-secrets"]}