RHSA-2026:55180
Vulnerability from csaf_redhat - Published: 2026-08-15 03:08 - Updated: 2026-08-25 15:42Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
helm3:
* helm3-3.21.4-0.1.hum1 (aarch64, x86_64)
* helm3-3.21.4-0.1.hum1.src (src)
Security Fix(es):
helm3:
* CVE-2026-63308
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Helm. A remote attacker can exploit a denial of service vulnerability by including zero-length byte slices, such as empty files, within Helm chart files. This can trigger an index out of range panic in the Files.Lines template helper, leading to deterministic render failures during template, installation, upgrade, linting, and SDK Engine.Render operations.
4.3 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:helm3-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:helm3-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:helm3-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
13 references
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"text": "An update for Red Hat Hardened Images RPMs is now available.",
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"text": "This update includes the following RPMs:\n\nhelm3:\n * helm3-3.21.4-0.1.hum1 (aarch64, x86_64)\n * helm3-3.21.4-0.1.hum1.src (src)\n\nSecurity Fix(es):\n\nhelm3:\n * CVE-2026-63308",
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"vulnerabilities": [
{
"cve": "CVE-2026-63308",
"cwe": {
"id": "CWE-129",
"name": "Improper Validation of Array Index"
},
"discovery_date": "2026-07-17T17:01:19.070077+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2501801"
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],
"notes": [
{
"category": "description",
"text": "A flaw was found in Helm. A remote attacker can exploit a denial of service vulnerability by including zero-length byte slices, such as empty files, within Helm chart files. This can trigger an index out of range panic in the Files.Lines template helper, leading to deterministic render failures during template, installation, upgrade, linting, and SDK Engine.Render operations.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Helm: Helm: Denial of Service via malformed chart files",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A denial of service flaw was found in Helm, a package manager for Kubernetes. The Files.Lines template helper in the chart-rendering engine does not check that an included chart file contains at least one line before indexing into it. A chart that contains a zero-length file causes an index-out-of-range panic, which stops the current template, install, upgrade, lint, or SDK Engine.Render operation from completing.\n\nRed Hat rates this issue as having a Moderate impact. Exploitation requires that a user or automated pipeline process a chart containing an empty file with Helm; the crafted chart must first be supplied by an untrusted chart source or repository. Because the panic only terminates the local Helm invocation rather than a long-running service, and does not expose or corrupt data, Red Hat assesses the impact to availability as Low, which is why Red Hat\u0027s score differs from the \"High\" availability impact used by NVD.",
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"Red Hat Hardened Images:helm3-main@aarch64",
"Red Hat Hardened Images:helm3-main@src",
"Red Hat Hardened Images:helm3-main@x86_64"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501801"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-63308"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-63308",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63308"
},
{
"category": "external",
"summary": "https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017",
"url": "https://github.com/helm/helm/commit/ba6c9a29efa7bf9198dad6a5ec12b4fb30c96017"
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"summary": "https://github.com/helm/helm/issues/32279",
"url": "https://github.com/helm/helm/issues/32279"
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"summary": "https://github.com/helm/helm/pull/32290",
"url": "https://github.com/helm/helm/pull/32290"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/chat2db-insecure-direct-object-reference-via-get-api-connection-datasource",
"url": "https://www.vulncheck.com/advisories/chat2db-insecure-direct-object-reference-via-get-api-connection-datasource"
}
],
"release_date": "2026-07-17T16:14:15.472000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-15T03:08:36+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:helm3-main@aarch64",
"Red Hat Hardened Images:helm3-main@src",
"Red Hat Hardened Images:helm3-main@x86_64"
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"restart_required": {
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"url": "https://access.redhat.com/errata/RHSA-2026:55180"
},
{
"category": "workaround",
"details": "There is no configuration change that fully prevents this issue; upgrading to a fixed version of Helm resolves it. As a workaround, verify that Helm charts obtained from third-party or untrusted sources do not contain zero-byte files before processing them with `helm template`, `helm install`, `helm upgrade`, `helm lint`, or the SDK Engine.Render function.",
"product_ids": [
"Red Hat Hardened Images:helm3-main@aarch64",
"Red Hat Hardened Images:helm3-main@src",
"Red Hat Hardened Images:helm3-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:helm3-main@aarch64",
"Red Hat Hardened Images:helm3-main@src",
"Red Hat Hardened Images:helm3-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "Helm: Helm: Denial of Service via malformed chart files"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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