Because the name is passed to c-ares as a C string, resolving attacker.example\0.trusted.example queries attacker.example and returns its records without any error. Applications that validate a hostname, for example against a domain allowlist, and then resolve it with dns.resolve*() can act on records for a different name than the one they validated.
This vulnerability affects Node.js 26.x, 24.x, and 22.x.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nodejs | node | unaffected |
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Solution
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Workaround
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Fri, 23 Oct 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Node.js DNS Resolve Function Truncation Enables Hostname Validation Bypass |
Fri, 23 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw in Node.js DNS resolution allows hostnames containing a NUL byte to be silently truncated by the dns.resolve*() functions and dns.reverse(). This is an incomplete fix of CVE-2026-48930, which only covered dns.lookup() and the net/tls host options. Because the name is passed to c-ares as a C string, resolving attacker.example\0.trusted.example queries attacker.example and returns its records without any error. Applications that validate a hostname, for example against a domain allowlist, and then resolve it with dns.resolve*() can act on records for a different name than the one they validated. This vulnerability affects Node.js 26.x, 24.x, and 22.x. | |
| Weaknesses | CWE-284 | |
| References |
| |
| Metrics |
cvssV3_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: hackerone
Published:
Updated: 2026-10-23T16:15:05.831Z
Reserved: 2026-10-05T15:00:00.729Z
Link: CVE-2026-105482
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-23T17:17:19.427
Modified: 2026-10-23T17:17:19.427
Link: CVE-2026-105482
Redhat
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OpenCVE Enrichment
Updated: 2026-10-23T17:30:17Z