Medium 5.9Published Aug 12, 2026

CVE-2026-19642Out-of-bounds write in the Base64 decoder in Amazon aws-sdk-cpp

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects aws-sdk-cpp and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for aws-sdk-cpp

Exploited in the last 30 days

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

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Analyzed
Record last updated: Aug 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS aws-sdk-cpp aws:sdk_cpp (from the name)	through 1.11.861	CNA record
amazon aws_software_development_kit amazon:aws_software_development_kit	before 1.11.862	NVD

References

https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-080-aws/vendor-advisory
https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-wxx3-prfc-69xxrelease-notes, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.