Vulnerability details

CVE-2026-12043

AWS aws-c-http

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

CVSS 4.0

8.7High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`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`
8.8High	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
AWS	aws-c-http	0.4.22 ≤ v ≤ 0.10.15	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/awslabs/aws-c-http/releases/tag/v0.11.0 patch
https://aws.amazon.com/security/security-bulletins/2026-043-aws/ vendor-advisory
https://github.com/awslabs/aws-c-http/security/advisories/GHSA-rmjr-3qpm-vh98 third-party-advisory

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Details

Published: 2026-06-12
Last updated: 2026-06-12
State: Published
Assigner (CNA): AMZN

Exploit prediction (EPSS)

0.34%

Probability of exploitation in 30 days

28.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-415
Double free