CVE-2018-16840

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Source
https://cve.org/CVERecord?id=CVE-2018-16840
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-16840.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-16840
Aliases
Downstream
Related
Published
2018-10-31T18:29:00Z
Modified
2026-09-10T09:11:35Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the Curl_close() function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.

Database specific 
{
    "unresolved_ranges": [
        {
            "cpes": [
                "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "14.04"
                },
                {
                    "last_affected": "14.04"
                },
                {
                    "introduced": "16.04"
                },
                {
                    "last_affected": "16.04"
                },
                {
                    "introduced": "18.04"
                },
                {
                    "last_affected": "18.04"
                },
                {
                    "introduced": "18.10"
                },
                {
                    "last_affected": "18.10"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "canonical:ubuntu_linux"
        }
    ]
}
References

Affected packages

Git / github.com/curl/curl

Affected ranges

Type
GIT
Repo
https://github.com/curl/curl
Events
Introduced
7a9dfff539fb30fbe5089684d72ef3b063a16c5b
Fixed
c4805b8c4d80c439ea3891f3cc89fd8ee31ac148
Fixed
81d135d67155c5295b1033679c606165d4e28f3f
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "7.59.0"
        },
        {
            "fixed": "7.62.0"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-16840.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "253867143457341161698845574111827314122",
            "length": 1388
        },
        "id": "CVE-2018-16840-5a294ae8",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f",
        "target": {
            "file": "lib/url.c",
            "function": "Curl_close"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "76450436232552618053190577593466383274",
                "56283251733270634435040735386618773715",
                "225146506795074944162099681821124504277",
                "72162716836877692358628916813877661635",
                "28202728034268574745574819732142521908"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2018-16840-97a670ad",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f",
        "target": {
            "file": "lib/url.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-10T09:11:35Z"