CVE-2025-22870 (GCVE-0-2025-22870)

Vulnerability from cvelistv5 – Published: 2025-03-12 18:27 – Updated: 2026-04-16 22:39
VLAI
Title
HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net
Summary
Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to "*.example.com", a request to "[::1%25.example.com]:80` will incorrectly match and not be proxied.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-18 16:31 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Go standard library net/http Affected: 0 , < 1.23.7 (semver)
Affected: 1.24.0-0 , < 1.24.1 (semver)
guessed Create a notification for this product.
golang.org/x/net golang.org/x/net/http/httpproxy Affected: 0 , < 0.36.0 (semver)
guessed Create a notification for this product.
golang.org/x/net golang.org/x/net/proxy Affected: 0 , < 0.36.0 (semver)
guessed Create a notification for this product.
Credits
Juho Forsén of Mattermost
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-05-09T20:03:37.043Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/03/07/2"
          },
          {
            "url": "https://security.netapp.com/advisory/ntap-20250509-0007/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "LOW",
              "baseScore": 4.4,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-22870",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-03-18T16:31:16.493335Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-115",
                "description": "CWE-115 Misinterpretation of Input",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-18T16:32:14.847Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net/http",
          "product": "net/http",
          "programRoutines": [
            {
              "name": "envProxyFunc"
            },
            {
              "name": "ProxyFromEnvironment"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.23.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.24.1",
              "status": "affected",
              "version": "1.24.0-0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/http/httpproxy",
          "product": "golang.org/x/net/http/httpproxy",
          "programRoutines": [
            {
              "name": "config.useProxy"
            },
            {
              "name": "domainMatch.match"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.36.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/proxy",
          "product": "golang.org/x/net/proxy",
          "programRoutines": [
            {
              "name": "PerHost.dialerForRequest"
            },
            {
              "name": "PerHost.AddFromString"
            },
            {
              "name": "Dial"
            },
            {
              "name": "FromEnvironment"
            },
            {
              "name": "FromEnvironmentUsing"
            },
            {
              "name": "PerHost.Dial"
            },
            {
              "name": "PerHost.DialContext"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.36.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Juho Fors\u00e9n of Mattermost"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to \"*.example.com\", a request to \"[::1%25.example.com]:80` will incorrectly match and not be proxied."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-115 Misinterpretation of Input",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-16T22:39:33.619Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/654697"
        },
        {
          "url": "https://go.dev/issue/71984"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/4t3lzH3I0eI/m/b42ImqrBAQAJ"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2025-3503"
        }
      ],
      "title": "HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2025-22870",
    "datePublished": "2025-03-12T18:27:59.376Z",
    "dateReserved": "2025-01-08T19:11:42.834Z",
    "dateUpdated": "2026-04-16T22:39:33.619Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-22870",
      "date": "2026-08-20",
      "epss": "0.00401",
      "percentile": "0.33572"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T02:16:11.000Z",
      "cve": "CVE-2025-22870",
      "id": "msrc_CVE-2025-22870",
      "initial_release_date": "2025-03-02T00:00:00.000Z",
      "product_status:fixed": "28",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "10",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-22870.json",
      "version": "12"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22870\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2025-03-12T19:15:38.310\",\"lastModified\":\"2026-06-17T08:50:40.640\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to \\\"*.example.com\\\", a request to \\\"[::1%25.example.com]:80` will incorrectly match and not be proxied.\"},{\"lang\":\"es\",\"value\":\"La coincidencia de hosts con patrones de proxy puede tratar incorrectamente un ID de zona IPv6 como un componente de nombre de host. Por ejemplo, si la variable de entorno NO_PROXY se establece en \\\"*.example.com\\\", una solicitud a \\\"[::1%25.example.com]:80` coincidir\u00e1 incorrectamente y no se procesar\u00e1 mediante proxy.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"Go standard library\",\"product\":\"net/http\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"net/http\",\"programRoutines\":[{\"name\":\"envProxyFunc\"},{\"name\":\"ProxyFromEnvironment\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.23.7\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"1.24.0-0\",\"lessThan\":\"1.24.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"golang.org/x/net\",\"product\":\"golang.org/x/net/http/httpproxy\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"golang.org/x/net/http/httpproxy\",\"programRoutines\":[{\"name\":\"config.useProxy\"},{\"name\":\"domainMatch.match\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"0.36.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"golang.org/x/net\",\"product\":\"golang.org/x/net/proxy\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"golang.org/x/net/proxy\",\"programRoutines\":[{\"name\":\"PerHost.dialerForRequest\"},{\"name\":\"PerHost.AddFromString\"},{\"name\":\"Dial\"},{\"name\":\"FromEnvironment\"},{\"name\":\"FromEnvironmentUsing\"},{\"name\":\"PerHost.Dial\"},{\"name\":\"PerHost.DialContext\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"0.36.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":1.8,\"impactScore\":2.5}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-03-18T16:31:16.493335Z\",\"id\":\"CVE-2025-22870\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-115\"}]}],\"references\":[{\"url\":\"https://go.dev/cl/654697\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/71984\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/4t3lzH3I0eI/m/b42ImqrBAQAJ\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2025-3503\",\"source\":\"security@golang.org\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2025/03/07/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.netapp.com/advisory/ntap-20250509-0007/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T20:57:39+00:00",
      "cve": "CVE-2025-22870",
      "id": "CVE-2025-22870",
      "initial_release_date": "2025-03-12T18:27:59.376000+00:00",
      "product_status:fixed": "329",
      "product_status:known_affected": "603",
      "product_status:known_not_affected": "105",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "golang.org/x/net/proxy: golang.org/x/net/http/httpproxy: HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22870.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-07T17:13:48Z",
      "cve": "CVE-2025-22870",
      "id": "CVE-2025-22870",
      "initial_release_date": "2025-03-05T02:30:40Z",
      "product_status:known_affected": "1650",
      "product_status:known_not_affected": "498",
      "product_status:recommended": "612",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-22870",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-22870.json",
      "version": "136"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2025/03/07/2\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20250509-0007/\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-05-09T20:03:37.043Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.4, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-22870\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-18T16:31:16.493335Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-115\", \"description\": \"CWE-115 Misinterpretation of Input\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-18T16:31:44.113Z\"}}], \"cna\": {\"title\": \"HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net\", \"credits\": [{\"lang\": \"en\", \"value\": \"Juho Fors\\u00e9n of Mattermost\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"net/http\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.23.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.24.0-0\", \"lessThan\": \"1.24.1\", \"versionType\": \"semver\"}], \"packageName\": \"net/http\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"envProxyFunc\"}, {\"name\": \"ProxyFromEnvironment\"}]}, {\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/http/httpproxy\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.36.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/http/httpproxy\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"config.useProxy\"}, {\"name\": \"domainMatch.match\"}]}, {\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/proxy\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.36.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/proxy\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"PerHost.dialerForRequest\"}, {\"name\": \"PerHost.AddFromString\"}, {\"name\": \"Dial\"}, {\"name\": \"FromEnvironment\"}, {\"name\": \"FromEnvironmentUsing\"}, {\"name\": \"PerHost.Dial\"}, {\"name\": \"PerHost.DialContext\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/654697\"}, {\"url\": \"https://go.dev/issue/71984\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/4t3lzH3I0eI/m/b42ImqrBAQAJ\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2025-3503\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to \\\"*.example.com\\\", a request to \\\"[::1%25.example.com]:80` will incorrectly match and not be proxied.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-115 Misinterpretation of Input\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-04-16T22:39:33.619Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-22870\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T22:39:33.619Z\", \"dateReserved\": \"2025-01-08T19:11:42.834Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2025-03-12T18:27:59.376Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.