FKIE_CVE-2026-34475

Vulnerability from fkie_nvd - Published: 2026-03-27 20:16 - Updated: 2026-04-22 19:40
Severity
5.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
References
cve@mitre.orghttps://vinyl-cache.org/security/VSV00018.htmlVendor Advisory, Mitigation
Impacted products
Vendor Product Version
varnish-software varnish_enterprise *
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
varnish-software varnish_enterprise 6.0.16
vinyl-cache vinyl_cache *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "E53A64C0-FC22-40B5-8C3B-6288B44AC3FC",
              "versionEndIncluding": "6.0.15",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r1:*:*:*:*:*:*",
              "matchCriteriaId": "F24D68B5-362E-4797-B6DE-C19A2893186C",
              "vulnerable": true
            },
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              "matchCriteriaId": "05E529DF-DEE1-4A62-998B-CA312DF888FD",
              "vulnerable": true
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              "matchCriteriaId": "8AB27B34-2951-4755-851C-7C942DAFB6C7",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass."
    }
  ],
  "id": "CVE-2026-34475",
  "lastModified": "2026-04-22T19:40:02.797",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 2.7,
        "source": "cve@mitre.org",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-27T20:16:36.390",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://vinyl-cache.org/security/VSV00018.html"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-180"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Primary"
    }
  ]
}


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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.