CVE-2026-1642 (GCVE-0-2026-1642)

Vulnerability from cvelistv5 – Published: 2026-02-04 15:02 – Updated: 2026-02-05 05:25
VLAI?
Title
NGINX vulnerability
Summary
A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data
Assigner
f5
References
Impacted products
Vendor Product Version
F5 NGINX Open Source Affected: 1.3.0 , < 1.29.5 (semver)
Create a notification for this product.
    F5 NGINX Plus Affected: R36 , < R36 P2 (custom)
Affected: R35 , < R35 P1 (custom)
Affected: R34 , < * (custom)
Affected: R33 , < * (custom)
Affected: R32 , < R32 P4 (custom)
Create a notification for this product.
Date Public ?
2026-02-04 15:00
Credits
F5
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-1642",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-04T16:01:47.913148Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-04T16:02:24.781Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-02-05T05:25:39.303Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/02/05/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "NGINX Open Source",
          "vendor": "F5",
          "versions": [
            {
              "changes": [
                {
                  "at": "1.28.2",
                  "status": "unaffected"
                }
              ],
              "lessThan": "1.29.5",
              "status": "affected",
              "version": "1.3.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "NGINX Plus",
          "vendor": "F5",
          "versions": [
            {
              "lessThan": "R36 P2",
              "status": "affected",
              "version": "R36",
              "versionType": "custom"
            },
            {
              "lessThan": "R35 P1",
              "status": "affected",
              "version": "R35",
              "versionType": "custom"
            },
            {
              "lessThan": "*",
              "status": "affected",
              "version": "R34",
              "versionType": "custom"
            },
            {
              "lessThan": "*",
              "status": "affected",
              "version": "R33",
              "versionType": "custom"
            },
            {
              "lessThan": "R32 P4",
              "status": "affected",
              "version": "R32",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "F5"
        }
      ],
      "datePublic": "2026-02-04T15:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eA vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\u2014along with conditions beyond the attacker\u0027s control\u2014may be able to inject plain text data into the response from an upstream proxied server.\u0026nbsp;\u0026nbsp;\u003c/span\u003e\u003c/span\u003eNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\n\n\u003c/span\u003e\u003cbr\u003e"
            }
          ],
          "value": "A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\u2014along with conditions beyond the attacker\u0027s control\u2014may be able to inject plain text data into the response from an upstream proxied server.\u00a0\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-349",
              "description": "CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-04T15:02:06.154Z",
        "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "shortName": "f5"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://my.f5.com/manage/s/article/K000159824"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "NGINX vulnerability",
      "x_generator": {
        "engine": "F5 SIRTBot v1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
    "assignerShortName": "f5",
    "cveId": "CVE-2026-1642",
    "datePublished": "2026-02-04T15:02:06.154Z",
    "dateReserved": "2026-01-29T18:26:26.996Z",
    "dateUpdated": "2026-02-05T05:25:39.303Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-1642\",\"sourceIdentifier\":\"f5sirt@f5.com\",\"published\":\"2026-02-04T15:16:14.190\",\"lastModified\":\"2026-02-13T21:35:01.730\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\u2014along with conditions beyond the attacker\u0027s control\u2014may be able to inject plain text data into the response from an upstream proxied server.\u00a0\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"f5sirt@f5.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"f5sirt@f5.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"f5sirt@f5.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-349\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-345\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.2.0\",\"versionEndIncluding\":\"1.6.2\",\"matchCriteriaId\":\"AE3A85CC-50DD-4BE7-A8BF-F2AA2744FCDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.0.0\",\"versionEndExcluding\":\"2.4.1\",\"matchCriteriaId\":\"95483FC6-1850-4C56-95C6-D65AEF39C5E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.4.0\",\"versionEndIncluding\":\"3.7.2\",\"matchCriteriaId\":\"53459EB1-5EAE-4F38-86CC-303408A91124\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.0.0\",\"versionEndIncluding\":\"4.0.1\",\"matchCriteriaId\":\"73A1CDBB-49F6-4AB6-AA67-542FD8017D6A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0.0\",\"versionEndExcluding\":\"5.3.3\",\"matchCriteriaId\":\"48DC8DC2-497F-48F9-A68B-8EA8DAA507E0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.15.1\",\"versionEndIncluding\":\"2.21.0\",\"matchCriteriaId\":\"05880D9D-7C68-42A8-9374-8BF4E6403757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.3.0\",\"versionEndExcluding\":\"1.28.2\",\"matchCriteriaId\":\"156F74E8-589F-43FC-AD64-74E2BFD11A62\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.29.0\",\"versionEndExcluding\":\"1.29.5\",\"matchCriteriaId\":\"6205FEE4-C23C-4FBA-953D-35E8B8644D64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"r33\",\"versionEndExcluding\":\"r35\",\"matchCriteriaId\":\"E7600A88-7651-4D8E-A04A-3AA81C850CC5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r32:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"36C4308E-651E-437C-84E7-10C542E3ADC2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA913184-EAAD-409E-99C6-AB979DAA93F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*\",\"matchCriteriaId\":\"782DF180-1101-4D6A-A1D7-8DADBAF6D9D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:*:*:*:*\",\"matchCriteriaId\":\"FB0B11F2-4748-492B-9906-F8C4C5EAFF12\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*\",\"matchCriteriaId\":\"46DC49B8-7286-4867-9CDA-1C1B469CD304\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*\",\"matchCriteriaId\":\"43477C2E-7485-4146-B25C-F58D632CD85B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r33:p3:*:*:*:*:*:*\",\"matchCriteriaId\":\"6A25B9CF-02C0-42DE-9C70-F2AD3ACE3CEB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7453D683-FCA7-46EE-BE49-5FD9A01D7F87\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r34:p2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A977BF9F-D165-4B93-B4D2-A177883A5E75\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r35:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"5D5FFD66-35C3-41AD-BD77-510E34A3AC6F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r36:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7E5F940-048A-446F-9A1E-074612CEA1AC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7993A0FB-BE7E-4634-BF7F-FDEE3582D3E7\"}]}]}],\"references\":[{\"url\":\"https://my.f5.com/manage/s/article/K000159824\",\"source\":\"f5sirt@f5.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/02/05/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/02/05/1\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-02-05T05:25:39.303Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-1642\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-02-04T16:01:47.913148Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-02-04T16:02:17.994Z\"}}], \"cna\": {\"title\": \"NGINX vulnerability\", \"source\": {\"discovery\": \"INTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"F5\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"F5\", \"product\": \"NGINX Open Source\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"1.28.2\", \"status\": \"unaffected\"}], \"version\": \"1.3.0\", \"lessThan\": \"1.29.5\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"F5\", \"product\": \"NGINX Plus\", \"versions\": [{\"status\": \"affected\", \"version\": \"R36\", \"lessThan\": \"R36 P2\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"R35\", \"lessThan\": \"R35 P1\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"R34\", \"lessThan\": \"*\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"R33\", \"lessThan\": \"*\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"R32\", \"lessThan\": \"R32 P4\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2026-02-04T15:00:00.000Z\", \"references\": [{\"url\": \"https://my.f5.com/manage/s/article/K000159824\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"F5 SIRTBot v1.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\\u2014along with conditions beyond the attacker\u0027s control\\u2014may be able to inject plain text data into the response from an upstream proxied server.\\u00a0\\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e\\n\\n\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e\\n\\n\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eA vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\\u2014along with conditions beyond the attacker\u0027s control\\u2014may be able to inject plain text data into the response from an upstream proxied server.\u0026nbsp;\u0026nbsp;\u003c/span\u003e\u003c/span\u003eNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\\n\\n\u003c/span\u003e\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-349\", \"description\": \"CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data\"}]}], \"providerMetadata\": {\"orgId\": \"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab\", \"shortName\": \"f5\", \"dateUpdated\": \"2026-02-04T15:02:06.154Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-1642\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-05T05:25:39.303Z\", \"dateReserved\": \"2026-01-29T18:26:26.996Z\", \"assignerOrgId\": \"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab\", \"datePublished\": \"2026-02-04T15:02:06.154Z\", \"assignerShortName\": \"f5\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.