CVE-2026-6276

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Source
https://cve.org/CVERecord?id=CVE-2026-6276
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6276.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-6276
Aliases
Downstream
ALPINE (1)
AZL (2)
BELL (1)
CGA (1)
CLSA (2)
DEBIAN (1)
ECHO (1)
JLSEC (1)
MINI (2)
OESA (5)
openSUSE (2)
RHSA (1)
ROOT (7)
SUSE (7)
UBUNTU (1)
Related
openSUSE (2)
SUSE (7)
Published
2026-05-13T08:28:19Z
Modified
2026-09-17T03:30:35Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
stale custom cookie host causes cookie leak
Details

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Database specific 
{
    "cna_assigner":  "curl",
    "cwe_ids":  [
        "CWE-346"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6276.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "7.71.0"
                },
                {
                    "fixed":  "8.14.2"
                },
                {
                    "introduced":  "8.15.0"
                },
                {
                    "fixed":  "8.16.1"
                },
                {
                    "introduced":  "e15e51384a423be31318b3c9c7d612a1aae661fd"
                },
                {
                    "fixed":  "3a19987a87f393d9394fe5acc7643f6c263c92db"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/curl/curl

Affected ranges

Type
GIT
Repo
https://github.com/curl/curl
Events
Introduced
e9db32a09af03f27e86d1251a9e68e9b7486d371
Fixed
a05f34973e6c4bb629d018f7cb51487be1c904d8
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "7.71.0"
        },
        {
            "fixed":  "8.20.0"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

7.*
7.71.0
7.71.1
7.72.0
7.73.0
7.74.0
7.75.0
7.76.0
7.76.1
7.77.0
7.78.0
7.79.0
7.79.1
7.80.0
7.81.0
7.82.0
7.83.0
7.83.1
7.84.0
7.85.0
7.86.0
7.87.0
7.88.0
7.88.1
8.*
8.0.0
8.0.1
8.1.0
8.1.1
8.1.2
8.10.0
8.10.1
8.11.0
8.11.1
8.12.0
8.12.1
8.13.0
8.14.0
8.14.1
8.15.0
8.16.0
8.18.0
8.19.0
8.2.0
8.2.1
8.3.0
8.4.0
8.5.0
8.6.0
8.7.0
8.7.1
8.8.0
8.9.0
8.9.1
Other
curl-7_71_0
curl-7_71_1
curl-7_72_0
curl-7_73_0
curl-7_74_0
curl-7_75_0
curl-7_76_0
curl-7_76_1
curl-7_77_0
curl-7_78_0
curl-7_79_0
curl-7_79_1
curl-7_80_0
curl-7_81_0
curl-7_82_0
curl-7_83_0
curl-7_83_1
curl-7_84_0
curl-7_85_0
curl-7_86_0
curl-7_87_0
curl-7_88_0
curl-7_88_1
curl-8_0_0
curl-8_0_1
curl-8_10_0
curl-8_10_1
curl-8_11_0
curl-8_11_1
curl-8_12_0
curl-8_12_1
curl-8_13_0
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_1_0
curl-8_1_1
curl-8_1_2
curl-8_2_0
curl-8_2_1
curl-8_3_0
curl-8_4_0
curl-8_5_0
curl-8_6_0
curl-8_7_0
curl-8_7_1
curl-8_8_0
curl-8_9_0
curl-8_9_1
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

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6276.json"