CVE-2026-47307: NULL pointer dereference vulnerability in Samsung Open Source Walrus allows an attacker to cause a denial of s

Routine

MEDIUM 5.5DOWNGRADE

CVE-2026-47307 is a medium-severity flaw (CVSS 5.5) affecting walrus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NULL pointer dereference vulnerability in Samsung Open Source Walrus allows an attacker to cause a denial of service via a crafted WebAssembly module containing deeply nested instructions. This issue affects Walrus: f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-05-19
Last modified	2026-07-24

Publisher (CNA): Samsung TV & Appliance · Vendor: samsung

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 04:16 UTCPublished CVE record published
2026-07-24 12:10 UTCUpdated Record last modified

samsung walrus DOWNGRADE

Affected: 2026-04-27

Fixed in: no fixed release known

Safe to downgrade to: a release before 2026-04-27

1. Check installed version

apt-cache policy walrus || rpm -q walrus || walrus --version

2. No fixed release: DOWNGRADE to a release before 2026-04-27 (Debian / Ubuntu)

apt-cache madison walrus sudo apt install walrus=<VERSION_BEFORE_2026-04-27> sudo apt-mark hold walrus

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list walrus sudo dnf downgrade walrus-<VERSION_BEFORE_2026-04-27> sudo dnf versionlock add walrus

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-47307?

walrus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47307 being exploited?

CVE-2026-47307 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-2026-47307 affect?

CVE-2026-47307 affects walrus. Severity is medium (CVSS 5.5). NULL pointer dereference vulnerability in Samsung Open Source Walrus allows an attacker to cause a denial of service via a crafted WebAssembly module containing deeply nested instructions. This issue affects Walrus: f339b8ee4ea701772e8ae64

How urgent is CVE-2026-47307?

Priority 21/100. No elevated risk signals yet.

Software pages

Samsung vulnerabilities

Related CVEs

CVE-2026-47308 MEDIUM 5.5 DOWNGRADE NULL pointer dereference vulnerability in Samsung Open Source Walrus allows Pointer Manipulation. This issue

References

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