How severe is CVE-2026-8369?

CVE-2026-8369 has a CVSS 4.0 base score of 6.0, rated medium severity.

Is CVE-2026-8369 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8369?

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

Does CVE-2026-8369 have an EU (EUVD) identifier?

Yes. CVE-2026-8369 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29955.

When was CVE-2026-8369 published?

CVE-2026-8369 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-8369

CVE-2026-8369 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. 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-20.

Key facts

Severity: Medium (CVSS 4.0 base score 6.0)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29955
Weakness: CWE-20
Published: 2026-05-13
Last modified: 2026-06-17

Description

Improper Input Validation in the NAT64 translator in The OpenThread Authors OpenThread before commit 26a882d on all platforms allows an attacker on the adjacent IPv4 network to inject corrupted IPv6 packets into the Thread mesh or bypass security checks via crafted IPv4 packets with options.

Frequently asked questions

What is CVE-2026-8369?: Improper Input Validation in the NAT64 translator in The OpenThread Authors OpenThread before commit 26a882d on all platforms allows an attacker on the adjacent IPv4 network to inject corrupted IPv6 packets into the Thread mesh or bypass security checks via crafted IPv4 packets with options.
How severe is CVE-2026-8369?: CVE-2026-8369 has a CVSS 4.0 base score of 6.0, rated medium severity.
Is CVE-2026-8369 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-8369?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-8369 have an EU (EUVD) identifier?: Yes. CVE-2026-8369 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29955.
When was CVE-2026-8369 published?: CVE-2026-8369 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/openthread/openthread/pull/12818

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