Vulnerability-Lookup

CVE-2026-9545 (GCVE-0-2026-9545)

Vulnerability from cvelistv5 – Published: 2026-07-03 06:17 – Updated: 2026-07-06 16:53

Title

exposing HTTP/3 early data

Summary

In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate. When libcurl returns to the hostname the second time with a cached SSL session (`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the `CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might send off the second request's bytes on that new connection *before* enforcing the certificate verification failure. Potentially leaking sensitive information.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Assigner

curl

References

3 references

URL	Tags
https://curl.se/docs/CVE-2026-9545.json
https://curl.se/docs/CVE-2026-9545.html
https://hackerone.com/reports/3752888

Impacted products

1 product

Vendor	Product	Version
curl	curl	Affected: 8.20.0 , ≤ 8.20.0 (semver) Affected: 8.19.0 , ≤ 8.19.0 (semver) Affected: 8.18.0 , ≤ 8.18.0 (semver) Affected: 8.17.0 , ≤ 8.17.0 (semver) Affected: 8.16.0 , ≤ 8.16.0 (semver) Affected: 8.15.0 , ≤ 8.15.0 (semver) Affected: 8.14.1 , ≤ 8.14.1 (semver) Affected: 8.14.0 , ≤ 8.14.0 (semver) Affected: 8.13.0 , ≤ 8.13.0 (semver) Affected: 8.12.1 , ≤ 8.12.1 (semver) Affected: 8.12.0 , ≤ 8.12.0 (semver) Affected: 8.11.1 , ≤ 8.11.1 (semver) Affected: 8.11.0 , ≤ 8.11.0 (semver)

Credits

Eunsoo Kim (Autonomous Code Security team at Microsoft) Stefan Eissing

Show details on NVD website

JSON

To clipboard

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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 7.5,
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              "confidentialityImpact": "HIGH",
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              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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                "id": "CVE-2026-9545",
                "options": [
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          "type": "finder",
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          "value": "In this scenario, libcurl first uses a proper HTTP/3 server for the initial\ntransfers, and when it makes a second transfer to the same site it has been\nreplaced by the attacker\u0027s impostor machine - without a valid certificate.\n\nWhen libcurl returns to the hostname the second time with a cached SSL session\n(`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the\n`CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might\nsend off the second request\u0027s bytes on that new connection *before* enforcing\nthe certificate verification failure. Potentially leaking sensitive\ninformation."
        }
      ],
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        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3752888"
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      ],
      "title": "exposing HTTP/3 early data"
    }
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    "datePublished": "2026-07-03T06:17:55.931Z",
    "dateReserved": "2026-05-26T06:45:08.680Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-06",
      "epss": "0.00134",
      "percentile": "0.03211"
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    "vulnrichment": {
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}

CERTFR-2026-AVI-0797

Vulnerability from certfr_avis - Published: 2026-06-24 - Updated: 2026-06-24

De multiples vulnérabilités ont été découvertes dans cURL et libcurl. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et un contournement de la politique de sécurité.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Curl	cURL et libcurl	cURL et libcurl versions antérieures à 8.21.0

References

Title

Publication Time

Tags

Bulletin de sécurité Curl CVE-2026-12064	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-9547	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-10536	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8286	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8927	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-11586	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-9079	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-11856	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8924	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8458	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-9546	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-9080	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-11352	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8932	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8926	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-9545	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-8925	2026-06-24	vendor-advisory
Bulletin de sécurité Curl CVE-2026-11564	2026-06-24	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "cURL et libcurl versions ant\u00e9rieures \u00e0 8.21.0",
      "product": {
        "name": "cURL et libcurl",
        "vendor": {
          "name": "Curl",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-8926",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8926"
    },
    {
      "name": "CVE-2026-11352",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-11352"
    },
    {
      "name": "CVE-2026-8458",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8458"
    },
    {
      "name": "CVE-2026-9546",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9546"
    },
    {
      "name": "CVE-2022-27782",
      "url": "https://www.cve.org/CVERecord?id=CVE-2022-27782"
    },
    {
      "name": "CVE-2026-10536",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-10536"
    },
    {
      "name": "CVE-2026-8932",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8932"
    },
    {
      "name": "CVE-2026-11856",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-11856"
    },
    {
      "name": "CVE-2026-11586",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-11586"
    },
    {
      "name": "CVE-2026-12064",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-12064"
    },
    {
      "name": "CVE-2026-8924",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8924"
    },
    {
      "name": "CVE-2026-9079",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9079"
    },
    {
      "name": "CVE-2026-9080",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9080"
    },
    {
      "name": "CVE-2026-9545",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9545"
    },
    {
      "name": "CVE-2026-8925",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8925"
    },
    {
      "name": "CVE-2026-8927",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8927"
    },
    {
      "name": "CVE-2026-11564",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-11564"
    },
    {
      "name": "CVE-2026-9547",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9547"
    },
    {
      "name": "CVE-2026-7168",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-7168"
    },
    {
      "name": "CVE-2026-8286",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8286"
    },
    {
      "name": "CVE-2026-5545",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-5545"
    }
  ],
  "initial_release_date": "2026-06-24T00:00:00",
  "last_revision_date": "2026-06-24T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0797",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-06-24T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    },
    {
      "description": "Contournement de la politique de s\u00e9curit\u00e9"
    },
    {
      "description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans cURL et libcurl. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance, une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et un contournement de la politique de s\u00e9curit\u00e9.",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans cURL et libcurl",
  "vendor_advisories": [
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-12064",
      "url": "https://curl.se/docs/CVE-2026-12064.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-9547",
      "url": "https://curl.se/docs/CVE-2026-9547.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-10536",
      "url": "https://curl.se/docs/CVE-2026-10536.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8286",
      "url": "https://curl.se/docs/CVE-2026-8286.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8927",
      "url": "https://curl.se/docs/CVE-2026-8927.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-11586",
      "url": "https://curl.se/docs/CVE-2026-11586.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-9079",
      "url": "https://curl.se/docs/CVE-2026-9079.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-11856",
      "url": "https://curl.se/docs/CVE-2026-11856.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8924",
      "url": "https://curl.se/docs/CVE-2026-8924.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8458",
      "url": "https://curl.se/docs/CVE-2026-8458.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-9546",
      "url": "https://curl.se/docs/CVE-2026-9546.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-9080",
      "url": "https://curl.se/docs/CVE-2026-9080.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-11352",
      "url": "https://curl.se/docs/CVE-2026-11352.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8932",
      "url": "https://curl.se/docs/CVE-2026-8932.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8926",
      "url": "https://curl.se/docs/CVE-2026-8926.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-9545",
      "url": "https://curl.se/docs/CVE-2026-9545.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-8925",
      "url": "https://curl.se/docs/CVE-2026-8925.html"
    },
    {
      "published_at": "2026-06-24",
      "title": "Bulletin de s\u00e9curit\u00e9 Curl CVE-2026-11564",
      "url": "https://curl.se/docs/CVE-2026-11564.html"
    }
  ]
}

FKIE_CVE-2026-9545

Vulnerability from fkie_nvd - Published: 2026-07-03 07:16 - Updated: 2026-07-06 18:20

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	2499f714-1537-4658-8207-48ae4bb9eae9	https://curl.se/docs/CVE-2026-9545.html
	2499f714-1537-4658-8207-48ae4bb9eae9	https://curl.se/docs/CVE-2026-9545.json
	2499f714-1537-4658-8207-48ae4bb9eae9	https://hackerone.com/reports/3752888
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://hackerone.com/reports/3752888

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThanOrEqual": "8.20.0",
              "status": "affected",
              "version": "8.20.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.19.0",
              "status": "affected",
              "version": "8.19.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.18.0",
              "status": "affected",
              "version": "8.18.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.17.0",
              "status": "affected",
              "version": "8.17.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.16.0",
              "status": "affected",
              "version": "8.16.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.15.0",
              "status": "affected",
              "version": "8.15.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.14.1",
              "status": "affected",
              "version": "8.14.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.14.0",
              "status": "affected",
              "version": "8.14.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.13.0",
              "status": "affected",
              "version": "8.13.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.12.1",
              "status": "affected",
              "version": "8.12.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.12.0",
              "status": "affected",
              "version": "8.12.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.11.1",
              "status": "affected",
              "version": "8.11.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.11.0",
              "status": "affected",
              "version": "8.11.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "2499f714-1537-4658-8207-48ae4bb9eae9"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In this scenario, libcurl first uses a proper HTTP/3 server for the initial\ntransfers, and when it makes a second transfer to the same site it has been\nreplaced by the attacker\u0027s impostor machine - without a valid certificate.\n\nWhen libcurl returns to the hostname the second time with a cached SSL session\n(`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the\n`CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might\nsend off the second request\u0027s bytes on that new connection *before* enforcing\nthe certificate verification failure. Potentially leaking sensitive\ninformation."
    }
  ],
  "id": "CVE-2026-9545",
  "lastModified": "2026-07-06T18:20:47.007",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9545",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-06T16:52:42.898546Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-03T07:16:25.807",
  "references": [
    {
      "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
      "url": "https://curl.se/docs/CVE-2026-9545.html"
    },
    {
      "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
      "url": "https://curl.se/docs/CVE-2026-9545.json"
    },
    {
      "source": "2499f714-1537-4658-8207-48ae4bb9eae9",
      "url": "https://hackerone.com/reports/3752888"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://hackerone.com/reports/3752888"
    }
  ],
  "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
  "vulnStatus": "Awaiting Analysis"
}

GHSA-6V72-WFCJ-JV53

Vulnerability from github – Published: 2026-07-03 09:31 – Updated: 2026-07-06 18:30

Details

When libcurl returns to the hostname the second time with a cached SSL session (CURLOPT_SSL_SESSIONID_CACHE is not disabled) and early data enabled (the CURLSSLOPT_EARLYDATA bit is set in CURLOPT_SSL_OPTIONS), libcurl might send off the second request's bytes on that new connection before enforcing the certificate verification failure. Potentially leaking sensitive information.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-9545"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-03T07:16:25Z",
    "severity": "HIGH"
  },
  "details": "In this scenario, libcurl first uses a proper HTTP/3 server for the initial\ntransfers, and when it makes a second transfer to the same site it has been\nreplaced by the attacker\u0027s impostor machine - without a valid certificate.\n\nWhen libcurl returns to the hostname the second time with a cached SSL session\n(`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the\n`CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might\nsend off the second request\u0027s bytes on that new connection *before* enforcing\nthe certificate verification failure. Potentially leaking sensitive\ninformation.",
  "id": "GHSA-6v72-wfcj-jv53",
  "modified": "2026-07-06T18:30:50Z",
  "published": "2026-07-03T09:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9545"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3752888"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-9545.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-9545.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-9545

Vulnerability from csaf_microsoft - Published: 2026-07-02 00:00 - Updated: 2026-07-04 01:04

Summary

exposing HTTP/3 early data

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-9545

Affected products

Under investigation 4 products

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—
Unresolved product id: 17084-4		—
Unresolved product id: 17084-3		—
Unresolved product id: 17084-2		—

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-9545 exposing HTTP/3 early data - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-9545.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "exposing HTTP/3 early data",
    "tracking": {
      "current_release_date": "2026-07-04T01:04:22.000Z",
      "generator": {
        "date": "2026-07-06T07:13:41.082Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-9545",
      "initial_release_date": "2026-07-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-07-04T01:04:22.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-9545",
      "notes": [
        {
          "category": "general",
          "text": "curl",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "under_investigation": [
          "17084-1",
          "17084-4",
          "17084-3",
          "17084-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-9545 exposing HTTP/3 early data - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-9545.json"
        }
      ],
      "title": "exposing HTTP/3 early data"
    }
  ]
}

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.

Action not permitted

CVE-2026-9545 (GCVE-0-2026-9545)

CERTFR-2026-AVI-0797

Solutions

FKIE_CVE-2026-9545

GHSA-6V72-WFCJ-JV53

MSRC_CVE-2026-9545

Tags

Sightings

Nomenclature