How serious is CVE-2026-1678?

This vulnerability has a CVSS score of 9.8 out of 10, classified as CRITICAL severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-1678?

Yes, proof-of-concept exploit code for CVE-2026-1678 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-1678?

CVE-2026-1678 affects zephyrproject zephyr. Check the full CVE details for specific version information.

How do I fix CVE-2026-1678?

To remediate CVE-2026-1678, check for security patches from zephyrproject. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-1678

Critical

|9.8

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker to send a specially crafted DNS response that can cause the system to write data outside of its allocated memory, potentially leading to crashes or the execution of malicious code. This issue occurs when the DNS resolver feature is enabled and assertions are turned off, making it easier for attackers to exploit the flaw.

Technical Description

dns_unpack_name() caches the buffer tailroom once and reuses it while appending DNS labels. As the buffer grows, the cached size becomes incorrect, and the final null terminator can be written past the buffer. With assertions disabled (default), a malicious DNS response can trigger an out-of-bounds write when CONFIG_DNS_RESOLVER is enabled.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeUnchanged

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$13,000($5K-$15K)

Vendor Response

Grade APatched in 4 days

Quick Information

Published

Mar 5, 2026

about 1 month ago

Last Modified

Mar 9, 2026

29 days ago

Vendor

zephyrproject

Product

zephyr