CVE-2026-19643

medium

Description

An out-of-bounds read issue in the Base64 decoder in Amazon aws-sdk-cpp before 1.11.862, on some platforms, might allow a remote authenticated user to crash an application that processes crafted Base64-encoded input. To remediate this issue, users should upgrade to version 1.11.862.

References

https://aws.amazon.com/security/security-bulletins/2026-080-aws/

https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x

https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862

Details

Source: Mitre, NVD

Published: 2026-08-12

Updated: 2026-08-18

Risk Information

CVSS v2

Base Score: 4.9

Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 6

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00332