CVE-2026-12043
Public on 2026-06-12
Modified on 2026-10-13
Description
Improper handling of HPACK dynamic table size updates in the AWS Common Runtime aws-c-http library might allow a remote threat actor operating a server to cause memory corruption on a connecting client application, potentially leading to arbitrary code execution, via a crafted sequence of HTTP/2 HEADERS frames.
To remediate this issue, users should upgrade to aws-c-http version 0.11.0.
To remediate this issue, users should upgrade to aws-c-http version 0.11.0.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2023 | mount-s3 | 2026-10-16 | ALAS2023-2026-3233 | Fixed |
| Amazon Linux 2027 Preview | mount-s3 | Not Affected | ||
| Amazon Linux 2023 | python-awscrt | Pending Fix | ||
| Amazon Linux 2027 Preview | python-awscrt | Pending Fix |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |