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CVE-2026-10740

Excessive memory allocation in s2n-quic

MEDIUM
5.3
CVSS Score
Published: June 10, 2026 at 06:09 PM UTC
Updated: October 26, 2026 at 11:10 AM UTC
1 product affected across 1 vendorS2N Quic

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

S2N Quic· AWS
90%
v ≤ 1.8.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
https://aws.amazon.com/security/security-bulletins/2026-042-aws/
Patch
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/s2n-quic/releases/tag/v1.82.0
Third Party Advisory
Source: ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/aws/s2n-quic/security/advisories/GHSA-9q54-f358-3fqf

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMAMZN
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-770

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