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        "dateReserved": "2026-10-05T08:47:01.523Z",
        "datePublished": "2026-10-05T18:58:56.161Z",
        "dateUpdated": "2026-10-07T17:20:06.153Z"
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    "containers": {
        "cna": {
            "title": "Cups: cups: argument injection in mailto notifier via notify-recipient-uri",
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                        "content": {
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                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "LOCAL",
                        "availabilityImpact": "NONE",
                        "baseScore": 2.5,
                        "baseSeverity": "LOW",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
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            "descriptions": [
                {
                    "lang": "en",
                    "value": "An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with \"-\" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user."
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            "affected": [
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                    "vendor": "Red Hat",
                    "product": "Red Hat Hardened Images",
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                    "packageName": "cups-main",
                    "defaultStatus": "affected",
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                            "version": "2.4.19-4.3.hum1",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
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                    "product": "Red Hat Enterprise Linux 10",
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                    "packageName": "cups",
                    "defaultStatus": "affected",
                    "cpes": [
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                    "product": "Red Hat Enterprise Linux 8",
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                    "packageName": "cups",
                    "defaultStatus": "affected",
                    "cpes": [
                        "cpe:/o:redhat:enterprise_linux:8"
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                    "product": "Red Hat Enterprise Linux 9",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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                    "packageName": "rhel9/cups",
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            "references": [
                {
                    "url": "https://access.redhat.com/errata/RHSA-2026:77638",
                    "name": "RHSA-2026:77638",
                    "tags": [
                        "vendor-advisory",
                        "x_refsource_REDHAT"
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                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545835",
                    "name": "RHBZ#2545835",
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                },
                {
                    "url": "https://github.com/OpenPrinting/cups/commit/1244ed9"
                },
                {
                    "url": "https://github.com/OpenPrinting/cups/commit/611d1bd"
                },
                {
                    "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3"
                }
            ],
            "datePublic": "2026-10-05T08:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-88",
                            "description": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "x_redhatCweChain": "CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Restrict network access to the CUPS service (port 631/tcp) to trusted hosts only, and avoid exposing cupsd to untrusted networks. If email notifications are not required, do not configure mailto subscriptions or remove/disable the mailto notifier. Ensure only a trusted mail transfer agent is installed and referenced from CUPS mailto configuration. Monitor for unexpected printer subscriptions and unusual sendmail activity from the lp user."
                }
            ],
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-09-13T00:00:00.000Z",
                    "value": "Reported to Red Hat."
                },
                {
                    "lang": "en",
                    "time": "2026-10-05T08:00:00.000Z",
                    "value": "Made public."
                }
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