CVE-2026-102715 (GCVE-0-2026-102715)
Vulnerability from cvelistv5 – Published: 2026-09-29 17:42 – Updated: 2026-09-29 18:42
VLAI
EPSS
VEX
Title
mDNS string-cache lookup matches on slot size, so a peer name aliases a shorter one and the response encoder writes past the packet
Summary
Any host on the LAN can send two mDNS records and make the responder write past the end of its
transmit packet.
The string table stores each name in a slot rounded up to a multiple of four:
```c
/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */
memory_len = ((memory_len & 0xFFFFFFFC) + 8) & 0xFFFFFFFF;
...
len = *((USHORT*)(p - 2)); /* slot size, not string length */
if ((len == memory_len) && ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)
```
The lookup that decides whether an incoming name is already stored compares the rounded slot size,
so names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered
with the pointer to the first, and the record then carries a string up to three bytes longer than
the length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only
bound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.
Two PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names
whose lengths fall in the same bucket:
```
==87491==ERROR: AddressSanitizer: heap-buffer-overflow
WRITE of size 1 at 0x611000000124 thread T5
#0 _nx_mdns_name_string_encode addons/mdns/nxd_mdns.c:13096
#1 _nx_mdns_packet_rr_add addons/mdns/nxd_mdns.c:8911
0x611000000124 is 0 bytes to the right of 228-byte region
```
The overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a
normal pool that lands in the next packet in the same pool rather than in a redzone, so the visible
effect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.
Compare the slot size against the stored string length before declaring a match, or keep the
string length in the slot header and return it to the caller so the encoder and the bound check
agree.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 18:41 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Eclipse Foundation | eclipse-threadx/netxduo |
Affected:
0 , ≤ 6.5.1
(semver)
|
guessed |
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"value": "\u003cp\u003eAny host on the LAN can send two mDNS records and make the responder write past the end of its\u003c/p\u003e\u003cp\u003etransmit packet.\u003c/p\u003e\u003cp\u003eThe string table stores each name in a slot rounded up to a multiple of four:\u003c/p\u003e\u003cp\u003e```c\u003c/p\u003e\u003cp\u003e/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */\u003c/p\u003e\u003cp\u003ememory_len = ((memory_len \u0026amp; 0xFFFFFFFC) + 8) \u0026amp; 0xFFFFFFFF;\u003c/p\u003e\u003cp\u003e...\u003c/p\u003e\u003cp\u003elen = *((USHORT*)(p - 2)); /* slot size, not string length */\u003c/p\u003e\u003cp\u003eif ((len == memory_len) \u0026amp;\u0026amp; ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eThe lookup that decides whether an incoming name is already stored compares the rounded slot size,\u003c/p\u003e\u003cp\u003eso names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered\u003c/p\u003e\u003cp\u003ewith the pointer to the first, and the record then carries a string up to three bytes longer than\u003c/p\u003e\u003cp\u003ethe length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only\u003c/p\u003e\u003cp\u003ebound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.\u003c/p\u003e\u003cp\u003eTwo PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names\u003c/p\u003e\u003cp\u003ewhose lengths fall in the same bucket:\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003e==87491==ERROR: AddressSanitizer: heap-buffer-overflow\u003c/p\u003e\u003cp\u003eWRITE of size 1 at 0x611000000124 thread T5\u003c/p\u003e\u003ccode\u003e #0 _nx_mdns_name_string_encode addons/mdns/nxd_mdns.c:13096\u003c/code\u003e\u003cbr\u003e\u003ccode\u003e #1 _nx_mdns_packet_rr_add addons/mdns/nxd_mdns.c:8911\u003c/code\u003e\u003cbr\u003e\u003cp\u003e0x611000000124 is 0 bytes to the right of 228-byte region\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eThe overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a\u003c/p\u003e\u003cp\u003enormal pool that lands in the next packet in the same pool rather than in a redzone, so the visible\u003c/p\u003e\u003cp\u003eeffect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.\u003c/p\u003e\u003cp\u003eCompare the slot size against the stored string length before declaring a match, or keep the\u003c/p\u003e\u003cp\u003estring length in the slot header and return it to the caller so the encoder and the bound check\u003c/p\u003e\u003cp\u003eagree.\u003c/p\u003e"
}
],
"value": "Any host on the LAN can send two mDNS records and make the responder write past the end of its\n\n\n\ntransmit packet.\n\n\n\nThe string table stores each name in a slot rounded up to a multiple of four:\n\n\n\n```c\n\n\n\n/* addons/mdns/nxd_mdns.c:11436, 11443, 11447 */\n\n\n\nmemory_len = ((memory_len \u0026 0xFFFFFFFC) + 8) \u0026 0xFFFFFFFF;\n\n\n\n...\n\n\n\nlen = *((USHORT*)(p - 2)); /* slot size, not string length */\n\n\n\nif ((len == memory_len) \u0026\u0026 ... _nx_mdns_name_match(start, memory_ptr, memory_size) ...)\n\n\n\n```\n\n\n\nThe lookup that decides whether an incoming name is already stored compares the rounded slot size,\n\n\n\nso names of 12, 13, 14 and 15 characters share one bucket. A second name in the bucket is answered\n\n\n\nwith the pointer to the first, and the record then carries a string up to three bytes longer than\n\n\n\nthe length the caller accounted for. `_nx_mdns_packet_rr_add` (nxd_mdns.c:8911) sizes its only\n\n\n\nbound check from that stale length, and `_nx_mdns_name_string_encode` writes the real string.\n\n\n\nTwo PTR records are enough, both ordinary mDNS responses to a `_http._tcp` query, with owner names\n\n\n\nwhose lengths fall in the same bucket:\n\n\n\n```\n\n\n\n==87491==ERROR: AddressSanitizer: heap-buffer-overflow\n\n\n\nWRITE of size 1 at 0x611000000124 thread T5\n\n #0 _nx_mdns_name_string_encode addons/mdns/nxd_mdns.c:13096\n #1 _nx_mdns_packet_rr_add addons/mdns/nxd_mdns.c:8911\n\n\n0x611000000124 is 0 bytes to the right of 228-byte region\n\n\n\n```\n\n\n\nThe overflow is one to three bytes of attacker-influenced name data past `nx_packet_data_end`. In a\n\n\n\nnormal pool that lands in the next packet in the same pool rather than in a redzone, so the visible\n\n\n\neffect is a corrupted neighbouring packet or a corrupted pool free list rather than a clean crash.\n\n\n\nCompare the slot size against the stored string length before declaring a match, or keep the\n\n\n\nstring length in the slot header and return it to the caller so the encoder and the bound check\n\n\n\nagree."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "ADJACENT",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-29T17:42:35.719Z",
"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
"shortName": "eclipse"
},
"references": [
{
"url": "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-2gf7-5224-5vrj"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "mDNS string-cache lookup matches on slot size, so a peer name aliases a shorter one and the response encoder writes past the packet",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
"assignerShortName": "eclipse",
"cveId": "CVE-2026-102715",
"datePublished": "2026-09-29T17:42:35.719Z",
"dateReserved": "2026-09-29T16:15:11.235Z",
"dateUpdated": "2026-09-29T18:42:21.812Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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