RHSA-2026:85234

Vulnerability from csaf_redhat - Published: 2026-10-19 15:55 - Updated: 2026-10-19 23:40
Summary
Red Hat Security Advisory: resteasy security update
Severity
Important
Notes
Topic: An update for resteasy is now available for Red Hat Enterprise Linux 9. 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: RESTEasy contains a JBoss project that provides frameworks to help build RESTful Web Services and RESTful Java applications. It is a fully certified and portable implementation of the JAX-RS specification. Security Fix(es): * resteasy-core: RESTEasy: IIOImageProvider Unbounded Image Decode (Decompression-Bomb DoS) (CVE-2026-89059) * resteasy-core: RESTEasy: CorsFilter Reflects Arbitrary Origin with Credentials under Wildcard Config (CVE-2026-89058) 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.
CVE-2026-89058

A flaw was found in RESTEasy's CorsFilter, which, when configured to allow all origins ("*"), reflects the request's Origin header back in the Access-Control-Allow-Origin response together with Access-Control-Allow-Credentials: true. This permissive cross-origin policy allows a malicious website to make credentialed cross-origin requests and read authenticated responses from a victim's session, resulting in a loss of confidentiality.

7.4 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
CWE-346 - Origin Validation Error
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-client-0:3.0.26-20.el9_8.1.noarch —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-core-0:3.0.26-20.el9_8.1.noarch —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-jackson2-provider-0:3.0.26-20.el9_8.1.noarch —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-servlet-initializer-0:3.0.26-20.el9_8.1.noarch —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:resteasy-0:3.0.26-20.el9_8.1.src —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-89059

A flaw was found in RESTEasy's IIOImageProvider, which decodes attacker-supplied image request bodies without enforcing any limit on the declared image dimensions or pixel count. A remote, unauthenticated attacker can send a small crafted image declaring enormous dimensions to trigger a very large memory allocation, exhausting the JVM heap and resulting in a denial of service.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Affected products
Fixed 5 products, the same list as for CVE-2026-89058
Threats
Impact Important
References
Acknowledgments
PayPal Cyber Security Team Yu Bao
To clipboard 

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          "url": "https://github.com/resteasy/resteasy/security/advisories/GHSA-m4pc-7gc7-9vw2"
        }
      ],
      "release_date": "2026-09-17T14:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-19T15:55:31+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",
          "product_ids": [
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-client-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-core-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-jackson2-provider-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-servlet-initializer-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:resteasy-0:3.0.26-20.el9_8.1.src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:85234"
        }
      ],
      "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": [
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-client-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-core-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-jackson2-provider-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:pki-resteasy-servlet-initializer-0:3.0.26-20.el9_8.1.noarch",
            "AppStream-9.8.0.Z.MAIN.EUS:resteasy-0:3.0.26-20.el9_8.1.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "resteasy-core: RESTEasy: IIOImageProvider Unbounded Image Decode (Decompression-Bomb DoS)"
    }
  ]
}



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