What is CVE-2026-12043?

CVE-2026-12043 is a high-severity vulnerability, classified under Double Free. CVSS score: 8.8/10. Published 2026-06-12.

How severe is CVE-2026-12043?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-12043

CVE-2026-12043

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 a…

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-415 — Double Free

References

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Frequently asked questions

What is CVE-2026-12043?: CVE-2026-12043 is a high-severity vulnerability, classified under Double Free. CVSS score: 8.8/10. Published 2026-06-12.
How severe is CVE-2026-12043?: High severity. CVSS v3 base score is 8.8 out of 10.