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.

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

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

No data.

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Project Subscriptions

Vendors Products
Aws Subscribe
Aws-sdk-cpp Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-080-aws/ cve-icon cve-icon
https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862 cve-icon cve-icon
https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x cve-icon cve-icon
History

Wed, 12 Aug 2026 20:15:00 +0000

Type Values Removed Values Added
References

Wed, 12 Aug 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms
First Time appeared Aws
Aws aws-sdk-cpp
Weaknesses CWE-125
CPEs cpe:2.3:a:aws:aws-sdk-cpp:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-sdk-cpp
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-08-12T19:46:45.274Z

Reserved: 2026-08-12T16:52:29.486Z

Link: CVE-2026-19643

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-12T20:17:42.800

Modified: 2026-08-12T20:50:27.407

Link: CVE-2026-19643

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses