Vulnerability-Lookup

RHSA-2026:67595

Vulnerability from csaf_redhat - Published: 2026-09-15 18:06 - Updated: 2026-09-15 23:48

Summary

Red Hat Security Advisory: goose bug fix and enhancement update

Severity

Important

Notes

Topic: An update for goose is now available for Red Hat Enterprise Linux 9.

Details: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Security Fix(es): * goose: aws-smithy-json: Denial of Service via uncontrolled recursion with deeply nested JSON (CVE-2026-18140) 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-2026-18140

A flaw was found in aws-smithy-json. This vulnerability allows a remote, unauthenticated attacker to cause a denial of service (DoS) in smithy-rs generated servers. By sending a small HTTP request containing deeply nested JSON, the attacker can trigger uncontrolled recursion in the aws-smithy-json runtime, leading to stack exhaustion and a process abort. This can make the affected server unavailable to legitimate users.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-0:1.38.0-1.el9_8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-0:1.38.0-1.el9_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-0:1.38.0-1.el9_8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-0:1.38.0-1.el9_8.src	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-0:1.38.0-1.el9_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debuginfo-0:1.38.0-1.el9_8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debuginfo-0:1.38.0-1.el9_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debuginfo-0:1.38.0-1.el9_8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debuginfo-0:1.38.0-1.el9_8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debugsource-0:1.38.0-1.el9_8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debugsource-0:1.38.0-1.el9_8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debugsource-0:1.38.0-1.el9_8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: Extensions-9.8.0.Z.MAIN.EUS:goose-debugsource-0:1.38.0-1.el9_8.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:67595	self
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-18140	self
https://bugzilla.redhat.com/show_bug.cgi?id=2509566	external
https://www.cve.org/CVERecord?id=CVE-2026-18140	external
https://nvd.nist.gov/vuln/detail/CVE-2026-18140	external
https://aws.amazon.com/security/security-bulletin…	external
https://crates.io/crates/aws-smithy-json/0.62.7	external
https://github.com/smithy-lang/smithy-rs/security…	external

JSON

To clipboard

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          "text": "A flaw was found in aws-smithy-json. This vulnerability allows a remote, unauthenticated attacker to cause a denial of service (DoS) in smithy-rs generated servers. By sending a small HTTP request containing deeply nested JSON, the attacker can trigger uncontrolled recursion in the aws-smithy-json runtime, leading to stack exhaustion and a process abort. This can make the affected server unavailable to legitimate users.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "aws-smithy-json: aws-smithy-json: Denial of Service via uncontrolled recursion with deeply nested JSON",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw in the `aws-smithy-json` runtime crate allows a remote unauthenticated attacker to trigger a denial of service by sending a crafted HTTP request with deeply nested JSON. Red Hat products utilizing `smithy-rs` generated servers, such as components in Red Hat Enterprise Linux and Red Hat Trusted Artifact Signer, are susceptible to service disruption if exposed to untrusted networks.",
          "title": "Statement"
        },
        {
          "category": "general",
          "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.",
          "title": "CVSS score applicability"
        }
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      "product_status": {
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18140"
        },
        {
          "category": "external",
          "summary": "RHBZ#2509566",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509566"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18140",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18140"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18140",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18140"
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        {
          "category": "external",
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      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-09-15T18:06:50+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          ],
          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:67595"
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          "category": "workaround",
          "details": "Restrict network access to services that process JSON input using the `aws-smithy-json` runtime. Configure firewalls to limit incoming connections to trusted sources, thereby reducing the exposure to remote unauthenticated denial of service attacks. If the service is reloaded or restarted, ensure firewall rules persist.",
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            "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",
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          ]
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "aws-smithy-json: aws-smithy-json: Denial of Service via uncontrolled recursion with deeply nested JSON"
    }
  ]
}

CVE-2026-18140 (GCVE-0-2026-18140)

Vulnerability from cvelistv5 – Published: 2026-07-30 18:34 – Updated: 2026-07-30 19:12

Title

Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers

Summary

Uncontrolled recursion in the unknown-key skip path of the aws-smithy-json runtime crate before 0.62.7, which the smithy-rs code generator invokes from every generated struct deserializer, might allow remote unauthenticated users to cause a denial of service (process abort via stack exhaustion) via a single small HTTP request containing deeply nested JSON to a smithy-rs generated server. To remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-30 19:12 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

AMZN mitre root

References

3 references

URL	Tags
https://crates.io/crates/aws-smithy-json/0.62.7	patch
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/smithy-lang/smithy-rs/security…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
AWS	aws-smithy-json	Affected: 0.32.0 , ≤ 0.62.6 (custom) cpe:2.3:a:aws:aws-smithy-json::::::::

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.

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.