CVE-2026-19642: An out-of-bounds write issue in the Base64 decoder in Amazon aws-sdk-cpp before 1.11.862 might allow a remote

Q: How do I fix CVE-2026-19642?

aws software development kit: upgrade to 1.11.862. Exact commands for each OS are on this page.

Q: Is CVE-2026-19642 being exploited?

CVE-2026-19642 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-19642 affect?

CVE-2026-19642 affects aws software development kit. Severity is medium (CVSS 5.9). 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

Q: How urgent is CVE-2026-19642?

Priority 36/100. On your watchlist

Routine

MEDIUM 5.9WATCHLISTUPGRADE

CVE-2026-19642 is a medium-severity flaw (CVSS 5.9) affecting aws software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-08-12
Last modified	2026-10-23

Publisher (CNA): AMZN · Vendor: amazon

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-12 20:17 UTCPublished CVE record published
2026-10-23 19:10 UTCUpdated Record last modified

amazon aws software development kit UPGRADE

Affected: < 1.11.862

Fixed in: 1.11.862

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy aws-software-development-kit || rpm -q aws-software-development-kit || aws-software-development-kit --version

2. UPGRADE to 1.11.862 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aws-software-development-kit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aws-software-development-kit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source

sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-19642?

aws software development kit: upgrade to 1.11.862. Exact commands for each OS are on this page.

Is CVE-2026-19642 being exploited?

CVE-2026-19642 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-19642 affect?

CVE-2026-19642 affects aws software development kit. Severity is medium (CVSS 5.9). 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

How urgent is CVE-2026-19642?

Priority 36/100. On your watchlist

Software pages

AWS vulnerabilities

Related CVEs

CVE-2026-19643 MEDIUM 5.3 UPGRADE An out-of-bounds read issue in the Base64 decoder in Amazon aws-sdk-cpp before 1.11.862, on some platforms, mi

References

← Back to latest CVEs