CVE-2026-12043CWE-415

Heap double-free in AWS Common Runtime aws-c-http

High · published June 12, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-415 · Double Free
Published
2026-06-12T18:35Z
EPSS history
Timeline
  • 12 JUN 18:35Z
    Heap double-free in AWS Common Runtime aws-c-http
    cvelistv5