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No exploitation reportedFix available

CVE-2026-18140

No exploitation reported by the sources we read.

  • Published2026-07-30
  • Fixed in0.62.7
  • WeaknessCWE-674

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-07-3019:17CVE publishedNVD

Versions per branch

NVD · OSV
Amazon aws-smithy-json
BranchAffectedFixed in
0.62< 0.62.70.62.7

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As AMZN, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • aws-smithy-jsonother versions: not affected
    Affected
    • ≥ 0.32.0, ≤ 0.62.6no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-30

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apollo-router-2.10MinimOSall versions · no fixed version listed
  • apollo-router-2.10Chainguardall versions · no fixed version listed
  • codexWolfiall versions · fixed in 0.162.1-r1
  • codexChainguardall versions · fixed in 0.162.1-r1
  • efs-utilsMinimOSall versions · fixed in 3.1.2-r0and 1 other package
  • gooseRed Hat:enterprise_linux:10.2all versions · fixed in 0:1.38.0-1.el10_2and 2 other packages
  • gooseRed Hat:enterprise_linux:9::extensionsall versions · fixed in 0:1.38.0-1.el9_8and 2 other packages
  • peerdb-serverMinimOSall versions · fixed in 0.36.27-r0

4 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-18140 Red Hat Product Security47 products fixed · 1 known affected

    aws-smithy-json: aws-smithy-json: Denial of Service via uncontrolled recursion with deeply nested JSON

    rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer

  • RHSA-2026:83603 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: RHTAS 1.4.4 - Red Hat Trusted Artifact Signer Release

  • RHSA-2026:83013 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.0.17

  • RHSA-2026:70870 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.5.3

  • RHSA-2026:68349 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.2.13

  • RHSA-2026:67595 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: goose bug fix and enhancement update

2 more advisories

Full record on NVD

Fix

  1. Update Amazon aws-smithy-json to 0.62.7
  2. Vendor fix Red Hat Product Security RHSA-2026:83603 · 5 productsRed Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev Platform Engineers, Software Develop…
  3. Vendor fix Red Hat Product Security RHSA-2026:83013 · 4 productsFor OpenShift Container Platform 4.16 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.16/html/relea…
  4. Vendor fix Red Hat Product Security RHSA-2026:70870 · 4 productsFor OpenShift Container Platform 4.21 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/relea…
  5. Vendor fix Red Hat Product Security RHSA-2026:68349 · 4 productsFor OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/relea…
  6. Vendor fix Red Hat Product Security RHSA-2026:67595 · 13 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2026:66521 · 4 productsFor OpenShift Container Platform 4.22 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/relea…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-24
  • CISA-ADPSSVC decisionnone2026-07-30
  • CNACVSS 4.08.7known since 2026-10-24
  • CNACVSS 3.17.5known since 2026-10-24
  • CNAweakness (CWE)CWE-674known since 2026-10-24
  • FIRST EPSSEPSS score0.8 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-10-02

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-07-30
Last Modified
2026-10-23
NVD status
Analyzed
GitHub Advisory
GHSA-8ffr-xgwf-xj56

Frequently asked questions

What is CVE-2026-18140?

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.

Is CVE-2026-18140 actively exploited?

Active exploitation of CVE-2026-18140 has not been confirmed. Its EPSS score was 0.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-18140?

CVE-2026-18140 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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