CVE-2026-18140: amazon aws-smithy-json Uncontrolled Recursion
Vulnerability summary
CVE-2026-18140 is a high (CVSS 8.7) Uncontrolled Recursion vulnerability in amazon aws-smithy-json. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.9% of scored vulnerabilities.
Timeline
- 30-07-2026PublishedVulnerability first disclosed.
- 30-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
11 scores · 6 sources · 2 versions- OSV · WolfiEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · Crates.ioEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- NVDNIST8.7HighCVSS: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
- OSV · Red hatEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · Crates.ioEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
36%
Versus all other CVEs
30-day change
0.00 pp
From 0.43% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard4 products
- apollo-router-2.10All versions (No fix recorded)
- codexAll versions (No fix recorded) | < 0.162.1-r1
- pixiAll versions (No fix recorded) | < 0.81.0-r3
- zed< 1.21.0-r4
Redhat3 products
- goose< 0:1.38.0-1.el10_2 | < 0:1.38.0-1.el9_8
- goose-debuginfo< 0:1.38.0-1.el10_2 | < 0:1.38.0-1.el9_8
- goose-debugsource< 0:1.38.0-1.el10_2 | < 0:1.38.0-1.el9_8
Wolfi3 products
- codexAll versions (No fix recorded) | < 0.162.1-r1
- pixiAll versions (No fix recorded) | < 0.81.0-r3
- zed< 1.21.0-r4
Amazon1 product
- aws-smithy-json< 0.62.7
Aws1 product
- aws-smithy-json≥ 0.32.0, ≤ 0.62.6
Crates.Io1 product
- aws-smithy-json< 0.62.7
6 vendors · 13 products
References
16 links- github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56Third Party AdvisoryARTICLEWEBVendor Advisory
