High severity7.5NVD Advisory· Published Jul 30, 2026· Updated Aug 10, 2026
CVE-2026-18140
CVE-2026-18140
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
aws-smithy-jsoncrates.io | < 0.62.7 | 0.62.7 |
Affected products
3- Range: <0.62.7
- Range: <0.62.7
Patches
Vulnerability mechanics
References
8- aws.amazon.com/security/security-bulletins/2026-067-aws/nvdVendor Advisory
- github.com/advisories/GHSA-8ffr-xgwf-xj56ghsaADVISORY
- github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-18140ghsaADVISORY
- aws.amazon.com/security/security-bulletins/2026-067-awsghsaWEB
- crates.io/crates/aws-smithy-json/0.62.7nvdProductWEB
- github.com/smithy-lang/smithy-rs/commit/8f0882046c467981ba5b4fd91a10befa96bd262fghsaWEB
- github.com/smithy-lang/smithy-rs/pull/4685ghsaWEB
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