RHSA-2026:91476

Vulnerability from csaf_redhat - Published: 2026-10-27 22:55 - Updated: 2026-10-29 22:09
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: rabbitmq-server4.3: * rabbitmq-server4.3-4.3.7-0.2.hum1 (aarch64, s390x, x86_64) * rabbitmq-server4.3-4.3.7-0.2.hum1.src (src) Security Fix(es): rabbitmq-server4.3: * CVE-2026-65627
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 jose. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) through memory exhaustion. When processing JSON Web Encryption (JWE) tokens that use compression, the library decompresses the payload without enforcing limits on the output size or expansion ratio. An attacker can exploit this issue by sending a small, crafted token, causing the application to consume excessive memory and crash.

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@s390x —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important

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    {
      "cve": "CVE-2026-65627",
      "cwe": {
        "id": "CWE-409",
        "name": "Improper Handling of Highly Compressed Data (Data Amplification)"
      },
      "discovery_date": "2026-10-26T20:02:39.548058+00:00",
      "ids": [
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          "text": "2561063"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in jose. This vulnerability allows an unauthenticated remote attacker to cause a Denial of Service (DoS) through memory exhaustion. When processing JSON Web Encryption (JWE) tokens that use compression, the library decompresses the payload without enforcing limits on the output size or expansion ratio. An attacker can exploit this issue by sending a small, crafted token, causing the application to consume excessive memory and crash.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "jose: jose: Denial of Service via unbounded decompression of crafted JWE tokens",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A decompression bomb vulnerability was discovered in the Erlang and Elixir jose library when handling JSON Web Encryption (JWE) tokens with compression enabled (DEF). The library uncompresses ciphertext using zlib:inflate/2 without bounding the output size or inflation ratio. An unauthenticated remote attacker can exploit this flaw by submitting a small, highly compressed crafted JWE token, causing uncontrolled memory allocation that exhausts system resources and crashes the BEAM virtual machine, resulting in a denial of service.",
          "title": "Statement"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@src",
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        {
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          "url": "https://cna.erlef.org/cves/CVE-2026-65627.html"
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        {
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          "summary": "https://github.com/potatosalad/erlang-jose/commit/857eb8e7f2d33e2c9ca2189e77226561cacaf2ad",
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          "summary": "https://osv.dev/vulnerability/EEF-CVE-2026-65627",
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65627"
        }
      ],
      "release_date": "2026-10-26T19:53:16.336000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-27T22:55:23+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": [
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            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@s390x",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@src",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:91476"
        },
        {
          "category": "workaround",
          "details": "Reject JWE tokens carrying the \"zip\": \"DEF\" header at the application gateway or API perimeter before decryption routines are executed.",
          "product_ids": [
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@aarch64",
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            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@src",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@aarch64",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@s390x",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@src",
            "Red Hat Hardened Images:rabbitmq-server4.3-0:4.3.7-0.2.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "jose: jose: Denial of Service via unbounded decompression of crafted JWE tokens"
    }
  ]
}



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