How severe is CVE-2026-41429?

CVE-2026-41429 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41429?

CVE-2026-41429 affects Espressif Arduino-esp32. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41429?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-41429 have an EU (EUVD) identifier?

Yes. CVE-2026-41429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25619.

When was CVE-2026-41429 published?

CVE-2026-41429 was published on 2026-04-24 and last updated on 2026-06-17.

CVE-2026-41429

CVE-2026-41429 is a high-severity vulnerability in Espressif Arduino-esp32 with a CVSS 3.x base score of 8.8. 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-121.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25619
Weakness: CWE-121
Affected product: Espressif Arduino-esp32
Published: 2026-04-24
Last modified: 2026-06-17

Description

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 enforcing a bound consistent with the fixed-size destination buffers used later in the flow. This vulnerability is fixed in 3.3.8.

Frequently asked questions

What is CVE-2026-41429?: 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 enforcing a bound consistent with the fixed-size destination buffers used later in the flow. This vulnerability is fixed in 3.3.8.
How severe is CVE-2026-41429?: CVE-2026-41429 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41429?: CVE-2026-41429 affects Espressif Arduino-esp32. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-41429 have an EU (EUVD) identifier?: Yes. CVE-2026-41429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25619.
When was CVE-2026-41429 published?: CVE-2026-41429 was published on 2026-04-24 and last updated on 2026-06-17.

References

https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f

Affected products (1)

cpe:2.3:a:espressif:arduino-esp32:*:*:*:*:*:*:*:*

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