Excessive memory allocation in s2n-quic
Priority LOW 36CWE-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 · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.
Summary
Unbounded memory allocation in the CRYPTO frame reassembler in s2n-quic before 1.8.2 may allow an unauthenticated remote actor to cause a denial of service (degraded availability) by sending crafted QUIC Initial packets. To remediate this issue, users should upgrade to v1.8.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00291 21st percentileScored 2026-11-07
Fix Fixed s2n-quic (crates.io): 1.82.0
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 | s2n-quic | up to 1.8.1 | — | No fix listed | CNA |
| — | s2n-quic (crates.io) | before 1.82.0 | 1.82.0 | Patch available | GHSA-9q54-f358-3fqf |
- s2n-quic VendorAWS Affected up to 1.8.1 Fixed in — No fix listed CNA
- s2n-quic (crates.io) Vendor— Affected before 1.82.0 Fixed in 1.82.0 Patch available GHSA-9q54-f358-3fqf
Remediation
- Fix · GHSA-9q54-f358-3fqf s2n-quic (crates.io) Fixed in 1.82.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-10740
- 2026-10-03 Alias added: GHSA-9q54-f358-3fqf
References
Advisory 3
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-2026-10740 · CVE Program
- CVE-2026-10740 · NVD
- FIRST EPSS
- GHSA-9q54-f358-3fqf · 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