{"id":"CVE-2021-43860","aliases":["ALPINE-CVE-2021-43860","ALSA-2022:1792","CLSA-2026-1777541348","DEBIAN-CVE-2021-43860","DSA-5049-1","EUVD-2021-30724","GHSA-qpjc-vq3c-572j","MGASA-2022-0131","OESA-2022-1520","RHSA-2022:1792","RLSA-2022:1792","SUSE-SU-2022:0712-1","SUSE-SU-2022:3284-1","UBUNTU-CVE-2021-43860","openSUSE-SU-2022:0712-1","openSUSE-SU-2024:11740-1"],"status":"published","title":"Permissions granted to applications can be hidden from the user at install time","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01441,"percentile":0.73419,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-269","CWE-276"],"published":"2022-01-12T00:00:00Z","modified":"2026-11-03T06:32:58Z","fixes":[{"ecosystem":"Alpine:v3.15","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"flatpak","fixed_in":["1.12.3-r0"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"flatpak","fixed_in":["1.8.7-1.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"flatpak-devel","fixed_in":["1.8.7-1.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"flatpak-libs","fixed_in":["1.8.7-1.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"flatpak-selinux","fixed_in":["1.8.7-1.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"flatpak-session-helper","fixed_in":["1.8.7-1.el8"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"flatpak","fixed_in":["1.0.9-13.el7_9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"flatpak-builder","fixed_in":["1.0.0-13.el7_9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"flatpak-devel","fixed_in":["1.0.9-13.el7_9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"flatpak-libs","fixed_in":["1.0.9-13.el7_9.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"flatpak","fixed_in":["1.12.3-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"flatpak","fixed_in":["1.12.3-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"flatpak","fixed_in":["1.12.3-1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"flatpak","fixed_in":["1.0.3-10.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP2","package":"flatpak","fixed_in":["1.0.3-10.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP3","package":"flatpak","fixed_in":["1.0.3-8.oe1"],"sources":["osv"]},{"ecosystem":"Red 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15.3","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.7-4.12.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"flatpak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.3-1.1"}]}]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"fedoraproject","product":"fedora"},{"vendor":"flatpak","product":"flatpak"},{"vendor":"redhat","product":"enterprise_linux"}],"references":[{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-qpjc-vq3c-572j","tags":["x_transferred","Patch","Third Party Advisory","fix","advisory","article","report"]},{"url":"https://github.com/flatpak/flatpak/commit/54ec1a482dfc668127eaae57f135e6a8e0bc52da","tags":["x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/flatpak/flatpak/commit/65cbfac982cb1c83993a9e19aa424daee8e9f042","tags":["x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/flatpak/flatpak/commit/93357d357119093804df05acc32ff335839c6451","tags":["x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/flatpak/flatpak/commit/ba818f504c926baaf6e362be8159cfacf994310e","tags":["x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/flatpak/flatpak/commit/d9a8f9d8ccc0b7c1135d0ecde006a75d25f66aee","tags":["x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.10.6","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.12.3","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://www.debian.org/security/2022/dsa-5049","tags":["vendor-advisory","x_transferred","Third Party Advisory","advisory"]},{"url":"https://security.gentoo.org/glsa/202312-12","tags":["vendor-advisory","x_transferred","advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-43860","tags":["advisory"]},{"url":"https://errata.almalinux.org/8/ALSA-2022-1792.html","tags":["advisory"]},{"url":"https://vulners.com/cve/CVE-2021-43860","tags":["report"]},{"url":"https://errata.tuxcare.com/els_os/centos7els/CLSA-2026-1777541348.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-43860","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2022-0131.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29885","tags":["report"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/APFTBYGJJVJPFVHRXUW5PII5XOAFI4KH/","tags":["web"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.10.7","tags":["web"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.12.4","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/G4SGDDYLN2BFKCHIDCXL2QTDVHPMZZM4/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/IXKBERLJRYV7KXKGXOLI6IOXVBQNN4DP/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/UELF5NVMHRQ45DEBIRQGIVCV4PADFC37/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/F46WFOXXRE63UMMTLQB2FOJT4KLI5AR7/","tags":["web"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.12.5","tags":["web"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.12.6","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/T4OG73MX3JPZBHYMUXUULPTVL7ZOOTZ5/","tags":["web","advisory"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.12.7","tags":["web"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1520","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43860","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1792","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1980438","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2010533","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2041590","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_1792.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43860","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43860","tags":["advisory","report"]},{"url":"https://errata.rockylinux.org/RLSA-2022:1792","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20220712-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1194610","tags":["report"]},{"url":"https://bugzilla.suse.com/1194611","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-43860","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-21682","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20223284-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1191507","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-21261","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-41133","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-43860","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-43860","title":"Permissions granted to applications can be hidden from the user at install time","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T00:00:00Z","modified":"2024-08-04T04:10:17.171Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-30724","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T00:00:00Z","modified":"2024-08-04T04:10:17Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T03:24:12.599691Z"}],"nvd":[{"id":"CVE-2021-43860","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T22:15:07.977Z","modified":"2026-06-17T04:11:35.547Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-269","CWE-276"],"updated_at":"2026-11-02T14:07:03.418194Z"}],"osv":[{"id":"ALPINE-CVE-2021-43860","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T22:15:07.977Z","modified":"2026-11-03T06:32:58.691151836Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T07:16:09.603409Z"},{"id":"CVE-2021-43860","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T22:15:07.977Z","modified":"2026-10-20T14:32:30.012791875Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"DEBIAN-CVE-2021-43860","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T22:15:07.977Z","modified":"2026-10-23T18:04:16.682229914Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"OESA-2022-1520","title":"flatpak security update","description":"Application deployment framework for desktop apps.\r\n\r\nSecurity Fix(es):\r\n\r\nFlatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn\u0026apos;t properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there\u0026apos;s a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \u0026quot;xa.metadata\u0026quot; key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \u0026quot;metadata\u0026quot; file to ensure it wasn\u0026apos;t lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.(CVE-2021-43860)","status":"published","published":"2022-02-11T11:04:47Z","modified":"2026-08-18T01:16:23.289346014Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"RHSA-2022:1792","title":"Red Hat Security Advisory: flatpak security and bug fix update","status":"published","published":"2024-09-16T06:37:27Z","modified":"2026-06-26T12:21:17.499513641Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:09.62945Z"},{"id":"RLSA-2022:1792","title":"Moderate: flatpak security and bug fix update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.\n\nSecurity Fix(es):\n\n* flatpak: Permissions granted to applications can be hidden from the user at install time (CVE-2021-43860)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.6 Release Notes linked from the References section.","status":"published","published":"2022-05-10T08:01:39Z","modified":"2026-02-04T07:40:27.408232Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:24.322216Z"},{"id":"UBUNTU-CVE-2021-43860","description":"Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the \"xa.metadata\" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak compares these permissions to the *actual* metadata, from the \"metadata\" file to ensure it wasn't lied to. However, the actual metadata contents are loaded in several places where they are read as simple C-style strings. That means that, if the metadata file includes a null terminator, only the content of the file from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.","status":"published","published":"2022-01-12T22:15:00Z","modified":"2026-09-10T16:30:20.539430699Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","level":"high"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:29.220315Z"},{"id":"ALSA-2022:1792","title":"Moderate: flatpak security and bug fix update","description":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.\n\nSecurity Fix(es):\n\n* flatpak: Permissions granted to applications can be hidden from the user at install time (CVE-2021-43860)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2022-05-10T08:01:39Z","modified":"2026-10-29T11:01:17.137045277Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"CLSA-2026-1777541348","title":"flatpak: Fix of CVE-2021-43860","description":"- CVE-2021-43860: hidden permissions via null byte in metadata file","status":"published","published":"2026-05-02T01:08:30Z","modified":"2026-06-01T00:33:18.559238468Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"DSA-5049-1","title":"flatpak - security update","status":"published","published":"2022-01-20T00:00:00Z","modified":"2026-03-09T02:10:51.653006Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2022-0131","title":"Updated flatpak packages fix security vulnerability","description":"Flatpak doesn't properly validate that the permissions displayed to the\nuser for an app at install time match the actual permissions granted to\nthe app at runtime, in the case that there's a null byte in the metadata\nfile of an app. (CVE-2021-43860)\nPath traversal vulnerability (CVE-2022-21682)\nVarious other fixes and enhancements included in update to version 1.12.7.\n","status":"published","published":"2022-04-09T21:20:39Z","modified":"2026-04-16T04:41:57.983432631Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"openSUSE-SU-2022:0712-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\nUpdate to flatpak 1.10.7:\n\n- CVE-2022-21682: Introduce new option --nofilesystem=host:reset to support flatpak-builder 1.2.2 (bsc#1194611).\n- CVE-2021-43860: A malicious repository could hav sent invalid application metadata in a way that hides some of the app permissions displayed during installation (bsc#1194610).\n","status":"published","published":"2022-03-04T08:31:01Z","modified":"2026-02-04T03:00:59.861062Z","updated_at":"2026-11-02T16:58:32.653274Z"},{"id":"openSUSE-SU-2024:11740-1","title":"flatpak-1.12.3-1.1 on GA media","description":"These are all security issues fixed in the flatpak-1.12.3-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:41:52.963223Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2022:0712-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\nUpdate to flatpak 1.10.7:\n\n- CVE-2022-21682: Introduce new option --nofilesystem=host:reset to support flatpak-builder 1.2.2 (bsc#1194611).\n- CVE-2021-43860: A malicious repository could hav sent invalid application metadata in a way that hides some of the app permissions displayed during installation (bsc#1194610).\n","status":"published","published":"2022-03-04T08:31:25Z","modified":"2026-02-04T02:53:00.797309Z","updated_at":"2026-11-02T15:53:50.066806Z"},{"id":"SUSE-SU-2022:3284-1","title":"Security update for flatpak","description":"This update for flatpak fixes the following issues:\n\n- CVE-2021-41133: Fixed sandbox bypass via recent syscalls (bsc#1191507).\n- CVE-2021-43860: Fixed metadata validation (bsc#1194610).\n","status":"published","published":"2022-09-15T14:23:18Z","modified":"2026-02-04T02:45:22.977547Z","updated_at":"2026-11-02T15:53:51.440565Z"}]}}