Out-of-bounds Read in Amazon AWS Software Development Kit
CVE-2026-19643
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
- Amazon AWS Software Development Kit
- AWS Aws-Sdk-Cpp — versions 0
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, Release Notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory, Vendor Advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-19643?
- CVE-2026-19643 is a medium-severity vulnerability in Amazon AWS Software Development Kit, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-08-12.
- How severe is CVE-2026-19643?
- Medium severity. CVSS v3 base score is 5.3 out of 10.