CVE-2026-19643 json
Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms
published 2026-08-12 2 mo ago modified 2026-10-23 16 d ago also EUVD-2026-57524
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- amazon aws_software_development_kit 1.11.862
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 6.0 | 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 |
| CNA | 4.0 | 6.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- AWS aws-sdk-cpp
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
github.com
/aws/aws-sdk-cpp/releases/tag/1.11.862
release-notes, patch
-
aws.amazon.com
/security/security-bulletins/2026-080-aws/
vendor-advisory
-
github.com
/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x
release-notes, vendor-advisory
Sources
- CVE List CVE-2026-19643
- NVD CVE-2026-19643
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