CVE-2026-9546

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Source
https://cve.org/CVERecord?id=CVE-2026-9546
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9546.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-9546
Aliases
Downstream
ALPINE (1)
BELL (1)
CGA (20)
DEBIAN (1)
JLSEC (1)
MINI (2)
openSUSE (1)
RHSA (2)
UBUNTU (1)
Related
Published
2026-07-03T06:18:14Z
Modified
2026-10-28T11:09:54Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
sending old referer
Details

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPT_REFERER suppresses the header, the option failed to clear the internal state. As a result, the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.

Database specific 
{
    "cna_assigner":  "curl",
    "cwe_ids":  [
        "CWE-200"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9546.json"
}
References

Affected packages

Git / github.com/curl/curl

Affected ranges

Type
GIT
Repo
https://github.com/curl/curl
Events
Introduced
2eebc58c4b8d68c98c8344381a9f6df4cca838fd
Fixed
68720b4837284335b2d63cb358f8f6ce65f5bc55
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "8.18.0"
                },
                {
                    "fixed":  "8.21.0"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
2cb868242dc2ac9cd52ee64987ef51d5964a56f9
Fixed
862e8a74a84478d82973471b4f49dc2746c1780e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "2cb868242dc2ac9cd52ee64987ef51d5964a56f9"
                },
                {
                    "fixed":  "862e8a74a84478d82973471b4f49dc2746c1780e"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        }
    ]
}

Affected versions

8.*
8.18.0
8.19.0
8.20.0
Other
curl-8_18_0
curl-8_19_0
curl-8_20_0
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
rc-8_21_0-3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9546.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "329802710635362475633966257142929289229",
                "59722172210655117825890418870938329781",
                "183831522990858182837473479172905867047",
                "304554302798540308152858876043779062238"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-9546-7ba9ca43",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/862e8a74a84478d82973471b4f49dc2746c1780e",
        "target":  {
            "file":  "lib/transfer.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "192731219037552860576466850254657292841",
            "length":  3790
        },
        "id":  "CVE-2026-9546-93bc1aa3",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/862e8a74a84478d82973471b4f49dc2746c1780e",
        "target":  {
            "file":  "lib/transfer.c",
            "function":  "Curl_pretransfer"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:09:54Z"