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

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MEDIUM

Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms

Published Aug 12, 2026

6.0

MEDIUM

CVSS 4.0

EPSS 0.56%

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 products

Vendor AWS Product AWS-Sdk-Cpp Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <=1.11.861

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

AWS

AWS-Sdk-Cpp

unaffected

Version	Status	Constraints
0	affected	<=1.11.861

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-125

Out-of-bounds Read

References (3)

https://aws.amazon.com/security/security-bulletins/2026-080-aws/
vendor-advisoryVendor Advisory
https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862
release-notespatchRelease Notes
https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x
release-notesVendor Advisory

Link	Providers	Tags
https://aws.amazon.com/security/security-bulletins/2026-080-aws/		vendor-advisoryVendor Advisory
https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862		release-notespatchRelease Notes
https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x		release-notesVendor Advisory