CVE-2026-41429 (GCVE-0-2026-41429)
Vulnerability from cvelistv5 – Published: 2026-04-24 19:19 – Updated: 2026-04-27 13:34
VLAI?
Title
Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption
Summary
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.
Severity ?
8.8 (High)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| espressif | arduino-esp32 |
Affected:
< 3.3.8
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-41429",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-27T13:10:48.792547Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T13:34:49.485Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "arduino-esp32",
"vendor": "espressif",
"versions": [
{
"status": "affected",
"version": "\u003c 3.3.8"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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.\nThe 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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-121",
"description": "CWE-121: Stack-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-24T19:19:49.594Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f"
}
],
"source": {
"advisory": "GHSA-92j9-c75g-2c5f",
"discovery": "UNKNOWN"
},
"title": "Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-41429",
"datePublished": "2026-04-24T19:19:49.594Z",
"dateReserved": "2026-04-20T15:32:33.814Z",
"dateUpdated": "2026-04-27T13:34:49.485Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-41429",
"date": "2026-05-06",
"epss": "0.00019",
"percentile": "0.05064"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-41429\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-04-24T20:16:27.663\",\"lastModified\":\"2026-05-05T18:12:04.277\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\\nThe 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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-121\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:espressif:arduino-esp32:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"3.3.8\",\"matchCriteriaId\":\"35B2A78F-D184-4C35-B453-38DBAC30D614\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D1024B06-380B-4116-B7F9-A21A03534B0C\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32-c3:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6E01D235-2366-44F4-B671-4AE031802CC2\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32-c6:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D53A06B-8672-49C0-A6CF-426C13197C76\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32-h2:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D656CC6-B68D-4057-8E62-3DA86F123BF7\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32-s2:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"59AC37EB-FABC-459C-8044-A8E2CDBD0555\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:espressif:esp32-s3:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"50DFAAD7-E08D-4397-BE9A-6EC44EE0624A\"}]}]}],\"references\":[{\"url\":\"https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]},{\"url\":\"https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-41429\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-27T13:10:48.792547Z\"}}}], \"references\": [{\"url\": \"https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-27T13:10:49.777Z\"}}], \"cna\": {\"title\": \"Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption\", \"source\": {\"advisory\": \"GHSA-92j9-c75g-2c5f\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.8, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"espressif\", \"product\": \"arduino-esp32\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 3.3.8\"}]}], \"references\": [{\"url\": \"https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f\", \"name\": \"https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2c5f\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\\nThe 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-121\", \"description\": \"CWE-121: Stack-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-24T19:19:49.594Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-41429\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-27T13:34:49.485Z\", \"dateReserved\": \"2026-04-20T15:32:33.814Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-24T19:19:49.594Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…