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Critical

Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()

Type: advisorySource: Official CVE List1 source record

Netcore NR256CN through 1.5.140116 contains a pre-authentication stack overflow vulnerability in the Boa web server's user_ok() function, which copies Basic-auth usernames with unbounded strcpy() calls into 64-byte stack buffers. Unauthenticated attackers can send a username longer than 63 bytes to any protected /router/*.cgi route to crash the main Boa process or potentially execute code.

Announced Source revision 1
Original source ↗

CVE-2026-111711

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-111711

NR256CN

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Netcore",
    "product": "NR256CN",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "versionType": "custom",
        "lessThanOrEqual": "1.5.140116"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-111711

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#34447 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement