High [CVE-2026-18140] Denial of Service via uncontrolled recursion with deeply nested JSON
This high-severity Red Hat Linux advisory covers CVE-2026-18140 affecting Logging Subsystem for Red Hat OpenShift, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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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. This can make the affected server unavailable to legitimate users.
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. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-776. Affected Red Hat products: Logging Subsystem for Red Hat OpenShift; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Trusted Artifact Signer; Red Hat Trusted Profile Analyzer.
Red Hat lists Confidential Compute Attestation; Red Hat Trusted Profile Analyzer as not affected. Will not fix / out of support: Red Hat Trusted Profile Analyzer.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: goose.
- < 0.62.7
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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