CVE-2026-10740 json
Excessive memory allocation in s2n-quic
published 2026-06-10 4 mo ago modified 2026-10-26 14 d ago also GHSA-9q54-f358-3fqf , EUVD-2026-36103
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | s2n-quic | <1.82.0 |
1.82.0 |
Affected products
- AWS s2n-quic
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/aws/s2n-quic/releases/tag/v1.82.0
patch, web
-
aws.amazon.com
/security/security-bulletins/2026-042-aws/
vendor-advisory
-
github.com
/aws/s2n-quic/security/advisories/GHSA-9q54-f358-3fqf
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-10740
advisory
-
aws.amazon.com
/security/security-bulletins/2026-042-aws
web
-
github.com
/aws/s2n-quic
package
Sources
- CVE List CVE-2026-10740
- GitHub Advisory GHSA-9q54-f358-3fqf
- NVD CVE-2026-10740
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