CVE-2026-19816

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-19816", "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "state": "PUBLISHED", "assignerShortName": "fedora", "dateReserved": "2026-08-14T02:40:21.336Z", "datePublished": "2026-09-14T20:05:00.169Z", "dateUpdated": "2026-09-15T18:04:51.167Z"}, "containers": {"cna": {"title": "PackageKit: dnf5 backend ignores SIMULATE on RepoRemove", "descriptions": [{"lang": "en", "value": "A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "Incorrect Authorization"}]}], "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}}], "affected": [{"packageName": "PackageKit", "collectionURL": "https://github.com/PackageKit/PackageKit", "defaultStatus": "unaffected", "modules": ["dnf5 backend"], "programFiles": ["backends/dnf5/dnf5-backend-thread.cpp", "src/pk-transaction.c"], "versions": [{"version": "1.3.4", "lessThan": "1.4.0", "versionType": "semver", "status": "affected"}]}, {"vendor": "Fedora", "product": "Fedora", "packageName": "PackageKit", "collectionURL": "https://bodhi.fedoraproject.org/updates/?packages=PackageKit", "defaultStatus": "unaffected", "modules": ["dnf5 backend"], "versions": [{"version": "1.3.4", "lessThan": "1.4.0", "versionType": "semver", "status": "affected"}]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:9"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "compat-PackageKit08", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}], "references": [{"url": "https://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b", "tags": ["patch"]}, {"url": "https://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8", "tags": ["vendor-advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940", "tags": ["issue-tracking"]}], "credits": [{"lang": "en", "value": "Vivek Parikh (BreachX Zero Day Labs)"}], "datePublic": "2026-09-09T19:16:02.000Z", "providerMetadata": {"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "shortName": "fedora", "dateUpdated": "2026-09-14T20:05:00.169Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-15T17:38:41.601204Z", "id": "CVE-2026-19816", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-15T18:04:51.167Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-19816", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-15T17:38:41.601204Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-15T17:38:42.894Z"}}], "cna": {"title": "PackageKit: dnf5 backend ignores SIMULATE on RepoRemove", "credits": [{"lang": "en", "value": "Vivek Parikh (BreachX Zero Day Labs)"}], "metrics": [{"other": {"type": "Red Hat severity rating", "content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}], "affected": [{"modules": ["dnf5 backend"], "versions": [{"status": "affected", "version": "1.3.4", "lessThan": "1.4.0", "versionType": "semver"}], "packageName": "PackageKit", "programFiles": ["backends/dnf5/dnf5-backend-thread.cpp", "src/pk-transaction.c"], "collectionURL": "https://github.com/PackageKit/PackageKit", "defaultStatus": "unaffected"}, {"vendor": "Fedora", "modules": ["dnf5 backend"], "product": "Fedora", "versions": [{"status": "affected", "version": "1.3.4", "lessThan": "1.4.0", "versionType": "semver"}], "packageName": "PackageKit", "collectionURL": "https://bodhi.fedoraproject.org/updates/?packages=PackageKit", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "compat-PackageKit08", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "PackageKit", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}], "datePublic": "2026-09-09T19:16:02.000Z", "references": [{"url": "https://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b", "tags": ["patch"]}, {"url": "https://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8", "tags": ["vendor-advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940", "tags": ["issue-tracking"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "Incorrect Authorization"}]}], "providerMetadata": {"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "shortName": "fedora", "dateUpdated": "2026-09-14T20:05:00.169Z"}}}, "cveMetadata": {"cveId": "CVE-2026-19816", "state": "PUBLISHED", "dateUpdated": "2026-09-15T18:04:51.167Z", "dateReserved": "2026-08-14T02:40:21.336Z", "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5", "datePublished": "2026-09-14T20:05:00.169Z", "assignerShortName": "fedora"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"collectionURL": "https://github.com/PackageKit/PackageKit", "defaultStatus": "unaffected", "modules": ["dnf5 backend"], "packageName": "PackageKit", "programFiles": ["backends/dnf5/dnf5-backend-thread.cpp", "src/pk-transaction.c"], "versions": [{"lessThan": "1.4.0", "status": "affected", "version": "1.3.4", "versionType": "semver"}]}, {"collectionURL": "https://bodhi.fedoraproject.org/updates/?packages=PackageKit", "defaultStatus": "unaffected", "modules": ["dnf5 backend"], "packageName": "PackageKit", "product": "Fedora", "vendor": "Fedora", "versions": [{"lessThan": "1.4.0", "status": "affected", "version": "1.3.4", "versionType": "semver"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "unaffected", "packageName": "PackageKit", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10"], "defaultStatus": "unaffected", "packageName": "PackageKit", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unaffected", "packageName": "PackageKit", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "PackageKit", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "compat-PackageKit08", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:8"], "defaultStatus": "unaffected", "packageName": "PackageKit", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat"}], "source": "patrick@puiterwijk.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend."}], "id": "CVE-2026-19816", "lastModified": "2026-09-18T19:34:36.657", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "patrick@puiterwijk.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-19816", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-15T17:38:41.601204Z", "version": "2.0.3"}}]}, "published": "2026-09-14T20:16:43.760", "references": [{"source": "patrick@puiterwijk.org", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940"}, {"source": "patrick@puiterwijk.org", "url": "https://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b"}, {"source": "patrick@puiterwijk.org", "url": "https://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8"}], "sourceIdentifier": "patrick@puiterwijk.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "patrick@puiterwijk.org", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Vivek Parikh (BreachX Zero Day Labs) for reporting this issue.", "bugzilla": {"description": "packagekit: PackageKit: PackageKit dnf5 ignores SIMULATE on RepoRemove", "id": "2515940", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-863", "details": ["A flaw was found in PackageKit. In the dnf5 backend, the RepoRemove handler ignores the SIMULATE transaction flag and executes a real package removal, allowing an unprivileged local user to uninstall packages without polkit authorization."], "mitigation": {"lang": "en:us", "value": "Affects v1.3.4 through v1.3.6. Fixed in commit 33be77b. Upgrade to v1.4.0."}, "name": "CVE-2026-19816", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "PackageKit", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "PackageKit", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "compat-PackageKit08", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "PackageKit", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "PackageKit", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "PackageKit", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-09T19:36:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19816\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19816\nhttps://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b\nhttps://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8"], "statement": "This issue affects Fedora systems using PackageKit with the dnf5 backend. Red Hat Enterprise Linux is not affected because it ships PackageKit 1.2.x with the classic dnf backend, which does not include the vulnerable dnf5 code path. An attacker requires local access and the ability to invoke PackageKit as an unprivileged user. This flaw allows unauthorized package removal and can affect system integrity and availability, but does not provide arbitrary package installation or a root shell.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "packagekit", "vendor": "packagekit"}], "created": "2026-09-10T01:45:16.361812+00:00", "updated": "2026-09-20T22:15:05.380623+00:00", "vendors": ["packagekit", "packagekit$PRODUCT$packagekit"]}