CVE-2026-1678

⛔ critical

Summary

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 Score

9.4

Critical

EPSS Score

0.1

Exploit Probability

Published Date

2026-03-05

First Seen: 2026-03-06

📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.2% of all 330,193 vulnerabilities in our database.

#32,266

Top 10% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: Mar 5, 2026

🔍 Exploitation Status

Poc

Proof-of-concept available

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-03-09

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-787

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
zephyrproject	zephyr	Affected	< 4.3.0

🔗 References 1

https://github.com/zephyrproject-rtos/zephyr/securit...

Exploit Patch Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-10641	⚠️ high	7.1	0.2	Zephyr's Bluetooth Classic Hands-Free Profile (HFP) Hands-Free role parser (subsys/bluetooth/host/classic/hfp_hf.c) cont...	2026-06-17
CVE-2026-10635	🔶 medium	6.3	0.1	On Xtensa targets with CONFIG_USERSPACE and CONFIG_XTENSA_MMU, the page-table code (arch/xtensa/core/ptables.c) maintain...	2026-06-16
CVE-2026-10640	🔶 medium	4.2	0.1	Zephyr's IPv6 Neighbor Discovery send paths (net_ipv6_send_na, net_ipv6_send_ns, net_ipv6_send_rs in subsys/net/ip/ipv6_...	2026-06-16
CVE-2026-1679	⚠️ high	7.3	0.1	The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; ove...	2026-03-28
CVE-2026-0849	ℹ️ low	3.8	0.0	Malformed ATAES132A responses with an oversized length field overflow a 52-byte stack buffer in the Zephyr crypto driver...	2026-03-16
CVE-2026-4179	🔶 medium	6.1	0.0	Issues in stm32 USB device driver (drivers/usb/device/usb_dc_stm32.c) can lead to an infinite while loop.	2026-03-16

These CVEs affect the same products