# CVE-2026-19643: Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms

> CVE-2026-19643: Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-19643
Last updated: 2026-10-23T19:10:00Z

- Published: 2026-08-12 19:38 UTC · Updated: 2026-10-23 19:10 UTC · Assigner: AMZN
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.57%, 47th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-125

## 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.

## Affected vendors and products

- AWS: aws-sdk-cpp

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-19643)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-19643)
- [https://aws.amazon.com/security/security-bulletins/2026-080-aws/](https://aws.amazon.com/security/security-bulletins/2026-080-aws/)
- [https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862](https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862)
- [https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x](https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-19643 · Markdown: https://rewindex.com/cve/CVE-2026-19643.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-19643 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:52.691Z