RHSA-2026:85234

Vulnerability from csaf_redhat - Published: 2026-10-19 15:55 - Updated: 2026-11-06 22:23
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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          "category": "external",
          "summary": "https://github.com/resteasy/resteasy/commit/7c7e6b37c8b2451a37aed9cdc6978b447456bacb",
          "url": "https://github.com/resteasy/resteasy/commit/7c7e6b37c8b2451a37aed9cdc6978b447456bacb"
        },
        {
          "category": "external",
          "summary": "https://github.com/resteasy/resteasy/security/advisories/GHSA-m4pc-7gc7-9vw2",
          "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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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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.