RHSA-2026:20606
Vulnerability from csaf_redhat - Published: 2026-05-26 05:33 - Updated: 2026-08-21 12:44Summary
Red Hat Security Advisory: ruby4.0 security update
Severity
Important
Notes
Topic: An update for ruby4.0 is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, and extensible.
Security Fix(es):
* ruby/json: Ruby JSON: Denial of Service or Information Disclosure via format string injection (CVE-2026-33210)
* erb: ERB: Arbitrary code execution via deserialization bypass (CVE-2026-41316)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 Ruby JSON. This vulnerability, a format string injection, allows a remote attacker to cause a denial of service (DoS) or disclose sensitive information. The flaw occurs when processing specially crafted user-supplied documents with the allow_duplicate_key: false parsing option enabled.
9.1 (Critical)
Affected products
Fixed
34 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-0:4.0.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-0:4.0.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-0:4.0.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-0:4.0.3-34.el10_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-0:4.0.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debuginfo-0:4.0.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debuginfo-0:4.0.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debuginfo-0:4.0.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debuginfo-0:4.0.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debugsource-0:4.0.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debugsource-0:4.0.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debugsource-0:4.0.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-debugsource-0:4.0.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-devel-0:4.0.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-devel-0:4.0.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-devel-0:4.0.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-devel-0:4.0.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-0:0.5.7-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-0:0.5.7-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-0:0.5.7-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-0:0.5.7-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-debuginfo-0:0.5.7-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-debuginfo-0:0.5.7-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-debuginfo-0:0.5.7-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-mysql2-debuginfo-0:0.5.7-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-0:1.6.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-0:1.6.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-0:1.6.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-0:1.6.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-debuginfo-0:1.6.3-34.el10_2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-debuginfo-0:1.6.3-34.el10_2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-debuginfo-0:1.6.3-34.el10_2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:ruby4.0-rubygem-pg-debuginfo-0:1.6.3-34.el10_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:ruby4.0-doc-0:4.0.3-34.el10_2.noarch | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in ERB, a templating system for Ruby. An attacker who can trigger deserialization of untrusted data in a Ruby application can bypass existing protections. This vulnerability allows for arbitrary code execution by exploiting specific public methods that evaluate template source code, which were not properly guarded against deserialization attacks.
8.1 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2026-33210
Threats
Impact
Important
References
15 references
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-41316"
},
{
"category": "external",
"summary": "RHBZ#2461369",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461369"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-41316",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-41316"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-41316",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41316"
},
{
"category": "external",
"summary": "https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv",
"url": "https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv"
}
],
"release_date": "2026-04-24T02:35:41.160000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T05:33:25+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"scores": [
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "erb: ERB: Arbitrary code execution via deserialization bypass"
}
]
}
Loading…
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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