Resource allocation without limits in aws-smithy-http-server
Priority MEDIUM 45CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
Missing connection and header-read timeouts and the absence of a concurrent-connection cap in the default serve() path of Amazon aws-smithy-http-server might allow remote attackers to cause a denial of service by opening many connections and sending partial requests that are never completed, exhausting server sockets and tasks. To mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0075 55th percentileScored 2026-11-07
Fix Fixed aws-smithy-http-server (crates.io): 0.66.5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AWS | aws-smithy-http-server | up to 0.66.4 | — | No fix listed | CNA |
| — | aws-smithy-http-server (crates.io) | before 0.66.5 | 0.66.5 | Patch available | GHSA-jvxp-qmx7-gjpx |
- aws-smithy-http-server VendorAWS Affected up to 0.66.4 Fixed in — No fix listed CNA
- aws-smithy-http-server (crates.io) Vendor— Affected before 0.66.5 Fixed in 0.66.5 Patch available GHSA-jvxp-qmx7-gjpx
Remediation
- Fix · GHSA-jvxp-qmx7-gjpx aws-smithy-http-server (crates.io) Fixed in 0.66.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16756
- 2026-10-03 Alias added: GHSA-jvxp-qmx7-gjpx
References
Advisory 2
More AWS vulnerabilities
- TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
- TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9
Sources
- CVE-2026-16756 · CVE Program
- CVE-2026-16756 · NVD
- FIRST EPSS
- GHSA-jvxp-qmx7-gjpx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences