CVE-2026-19642

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

MEDIUM
5.9
CVSS Score
Published: August 12, 2026 at 07:36 PM UTC
Updated: October 23, 2026 at 07:10 PM UTC
2 products affected across 2 vendorsAWS Software Development KitAWS Software Development Kit

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.11.862
Affected range stops below 1.11.862, so it looks safe — our inference, not a vendor statement
0 ≤ v ≤ 1.11.861

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMAMZN
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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