CVE-2026-41429: arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontr

Q: How do I fix CVE-2026-41429?

arduino-esp32: upgrade to 3.3.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-41429 being exploited?

CVE-2026-41429 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-2026-41429 affect?

CVE-2026-41429 affects arduino-esp32. Severity is high (CVSS 8.8). arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, there is a remotely reachable memory corruption issue in the NBNS packet handling path. When NetBIOS is en

Q: How urgent is CVE-2026-41429?

Priority 42/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-41429 is a high-severity flaw (CVSS 8.8) affecting arduino-esp32. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, there is a remotely reachable memory corruption issue in the NBNS packet handling path. When NetBIOS is enabled by calling NBNS.begin(...), the device listens on UDP port 137 and processes untrusted NBNS requests from the local network. The request parser trusts the attacker-controlled name_len field without enforc

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-04-24
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: espressif

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 20:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

espressif arduino-esp32 UPGRADE

Affected: < 3.3.8

Fixed in: 3.3.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy arduino-esp32 || rpm -q arduino-esp32 || arduino-esp32 --version

2. UPGRADE to 3.3.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade arduino-esp32

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade arduino-esp32

Note

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

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-2026-41429?

arduino-esp32: upgrade to 3.3.8. Exact commands for each OS are on this page.

Is CVE-2026-41429 being exploited?

CVE-2026-41429 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-2026-41429 affect?

CVE-2026-41429 affects arduino-esp32. Severity is high (CVSS 8.8). arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, there is a remotely reachable memory corruption issue in the NBNS packet handling path. When NetBIOS is en

How urgent is CVE-2026-41429?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2026-42854 CRITICAL 9.8 UPGRADE arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontr
CVE-2026-42855 HIGH 7.5 UPGRADE arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontr

References

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