CVE-2026-8458 (GCVE-0-2026-8458)
Vulnerability from cvelistv5
Published
2026-07-03 06:14
Modified
2026-09-15 06:03
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-488 - Exposure of Data Element to Wrong Session
Summary
libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
References
Impacted products
Vendor Product Version
curl curl Version: 7.43.0   ≤
Version: 8.15.0   ≤
Version: 8.17.0   ≤
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   curl curl Version: 97c272e5d173ad5f706443e2477f0a84f0044edd
 Create a notification for this product.
   curl curl Version: 8.20.0
Version: 8.19.0
Version: 8.18.0
Version: 8.17.0
Version: 8.16.0
Version: 8.15.0
Version: 8.14.1
Version: 8.14.0
Version: 8.13.0
Version: 8.12.1
Version: 8.12.0
Version: 8.11.1
Version: 8.11.0
Version: 8.10.1
Version: 8.10.0
Version: 8.9.1
Version: 8.9.0
Version: 8.8.0
Version: 8.7.1
Version: 8.7.0
Version: 8.6.0
Version: 8.5.0
Version: 8.4.0
Version: 8.3.0
Version: 8.2.1
Version: 8.2.0
Version: 8.1.2
Version: 8.1.1
Version: 8.1.0
Version: 8.0.1
Version: 8.0.0
Version: 7.88.1
Version: 7.88.0
Version: 7.87.0
Version: 7.86.0
Version: 7.85.0
Version: 7.84.0
Version: 7.83.1
Version: 7.83.0
Version: 7.82.0
Version: 7.81.0
Version: 7.80.0
Version: 7.79.1
Version: 7.79.0
Version: 7.78.0
Version: 7.77.0
Version: 7.76.1
Version: 7.76.0
Version: 7.75.0
Version: 7.74.0
Version: 7.73.0
Version: 7.72.0
Version: 7.71.1
Version: 7.71.0
Version: 7.70.0
Version: 7.69.1
Version: 7.69.0
Version: 7.68.0
Version: 7.67.0
Version: 7.66.0
Version: 7.65.3
Version: 7.65.2
Version: 7.65.1
Version: 7.65.0
Version: 7.64.1
Version: 7.64.0
Version: 7.63.0
Version: 7.62.0
Version: 7.61.1
Version: 7.61.0
Version: 7.60.0
Version: 7.59.0
Version: 7.58.0
Version: 7.57.0
Version: 7.56.1
Version: 7.56.0
Version: 7.55.1
Version: 7.55.0
Version: 7.54.1
Version: 7.54.0
Version: 7.53.1
Version: 7.53.0
Version: 7.52.1
Version: 7.52.0
Version: 7.51.0
Version: 7.50.3
Version: 7.50.2
Version: 7.50.1
Version: 7.50.0
Version: 7.49.1
Version: 7.49.0
Version: 7.48.0
Version: 7.47.1
Version: 7.47.0
Version: 7.46.0
Version: 7.45.0
Version: 7.44.0
Version: 7.43.0
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhamad Arga Reksapati"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stefan Eissing"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo Negotiate-authenticated ones, even when they are set to use different\n\"services\".\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different services."
        }
      ],
      "problemTypes": [
        {
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              "description": "Exposure of Data Element to Wrong Session",
              "lang": "en",
              "type": "CWE"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T06:03:19.330Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
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        {
          "url": "https://curl.se/docs/CVE-2026-8458.json"
        },
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          "url": "https://curl.se/docs/CVE-2026-8458.html"
        },
        {
          "url": "https://hackerone.com/reports/3721183"
        }
      ],
      "title": "wrong reuse for different services",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_osv": {
        "affected": [
          {
            "ranges": [
              {
                "events": [
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                    "introduced": "7.43.0"
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                "repo": "https://github.com/curl/curl.git",
                "type": "GIT"
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            "versions": [
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              "8.19.0",
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        "aliases": [
          "CVE-2026-8458"
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        "credits": [
          {
            "name": "Muhamad Arga Reksapati",
            "type": "finder"
          },
          {
            "name": "Stefan Eissing",
            "type": "remediation developer"
          }
        ],
        "database_specific": {
          "CWE": {
            "desc": "Exposure of Data Element to Wrong Session",
            "id": "CWE-488"
          },
          "URL": "https://curl.se/docs/CVE-2026-8458.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3721183",
          "last_affected": "8.20.0",
          "package": "curl",
          "severity": "Low",
          "www": "https://curl.se/docs/CVE-2026-8458.html"
        },
        "details": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo Negotiate-authenticated ones, even when they are set to use different\n\"services\".\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different services.",
        "id": "CURL-CVE-2026-8458",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-06-24T08:00:00.00Z",
        "schema_version": "1.5.0",
        "summary": "wrong reuse for different services"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-8458",
    "datePublished": "2026-07-03T06:14:42.258Z",
    "dateReserved": "2026-05-13T08:33:36.632Z",
    "dateUpdated": "2026-09-15T06:03:19.330Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
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Due to a logical\\nerror in the code, a request that was issued by an application could\\nwrongfully reuse an existing connection to the same server that was\\nauthenticated using different services.\", \"summary\": \"wrong reuse for different services\", \"affected\": [{\"ranges\": [{\"type\": \"SEMVER\", \"events\": [{\"introduced\": \"7.43.0\"}, {\"fixed\": \"8.14.2\"}, {\"introduced\": \"8.15.0\"}, {\"fixed\": \"8.16.1\"}, {\"introduced\": \"8.17.0\"}, {\"fixed\": \"8.20.1\"}]}, {\"repo\": \"https://github.com/curl/curl.git\", \"type\": \"GIT\", \"events\": [{\"introduced\": \"97c272e5d173ad5f706443e2477f0a84f0044edd\"}, {\"fixed\": \"5e99b73cf441d9c369768b9cd48b5389b9a2503d\"}]}], \"versions\": [\"8.20.0\", \"8.19.0\", \"8.18.0\", \"8.17.0\", \"8.16.0\", \"8.15.0\", \"8.14.1\", \"8.14.0\", \"8.13.0\", \"8.12.1\", \"8.12.0\", \"8.11.1\", \"8.11.0\", \"8.10.1\", \"8.10.0\", \"8.9.1\", \"8.9.0\", \"8.8.0\", \"8.7.1\", \"8.7.0\", \"8.6.0\", \"8.5.0\", \"8.4.0\", \"8.3.0\", \"8.2.1\", 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      "cveMetadata": "{\"cveId\": \"CVE-2026-8458\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:03:19.330Z\", \"dateReserved\": \"2026-05-13T08:33:36.632Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-07-03T06:14:42.258Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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