CVE-2026-12490 (GCVE-0-2026-12490)

Vulnerability from cvelistv5 – Published: 2026-06-25 05:24 – Updated: 2026-06-25 05:24
VLAI
Title
Bypass of client certificate verification with transfer over TLS
Summary
When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-284 - Improper Access Control
Assigner
References
Impacted products
Vendor Product Version
NLnet Labs NSD Affected: 4.10.1 , < 4.14.3 (semver)
Create a notification for this product.
Date Public
2026-06-25 00:00
Credits
Qifan Zhang from Palo Alto Networks
Show details on NVD website
To clipboard 

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          "vendor": "NLnet Labs",
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              "versionType": "semver"
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Qifan Zhang from Palo Alto Networks"
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      "descriptions": [
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          "lang": "en",
          "value": "When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match."
        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "Transfer security restrictions for client certificates can be bypassed completely if the attacker can match the other access control conditions, and the tls-auth-xfr-only option is not explicitly set to yes (which it by default is not)"
            }
          ]
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "type": "CWE"
            },
            {
              "cweId": "CWE-284",
              "description": "CWE-284: Improper Access Control",
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      "providerMetadata": {
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        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
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          "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txt"
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      "solutions": [
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          "lang": "en",
          "value": "This issue is fixed starting with version 4.14.3."
        }
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      "timeline": [
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          "lang": "en",
          "time": "2026-06-15T00:00:00.000Z",
          "value": "Issue reported by Qifan Zhang"
        },
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          "lang": "en",
          "time": "2026-06-16T00:00:00.000Z",
          "value": "NLnet Labs shares patch"
        },
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          "lang": "en",
          "time": "2026-06-17T00:00:00.000Z",
          "value": "Qifan Zhang verifies patch"
        },
        {
          "lang": "en",
          "time": "2026-06-25T00:00:00.000Z",
          "value": "Fix released with version 4.14.3"
        }
      ],
      "title": "Bypass of client certificate verification with transfer over TLS",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2026-12490",
    "datePublished": "2026-06-25T05:24:41.814Z",
    "dateReserved": "2026-06-17T06:44:23.686Z",
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    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
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