How severe is CVE-2026-19643?

CVE-2026-19643 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-19643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-19643?

CVE-2026-19643 affects Amazon Aws Software Development Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-19643?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-19643 published?

CVE-2026-19643 was published on 2026-08-12 and last updated on 2026-08-18.

CVE-2026-19643

CVE-2026-19643 is a medium-severity vulnerability in Amazon Aws Software Development Kit with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.0
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Amazon Aws Software Development Kit
Published: 2026-08-12
Last modified: 2026-08-18

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.

Frequently asked questions

What is CVE-2026-19643?: 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.
How severe is CVE-2026-19643?: CVE-2026-19643 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-19643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-19643?: CVE-2026-19643 affects Amazon Aws Software Development Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-19643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-19643 published?: CVE-2026-19643 was published on 2026-08-12 and last updated on 2026-08-18.

References

Affected products (1)

cpe:2.3:a:amazon:aws_software_development_kit:*:*:*:*:*:c\+\+:*:*

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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