{"id":"UBUNTU-CVE-2021-3521","details":"There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a \"binding signature.\" RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources.","modified":"2026-05-20T16:05:05.136753288Z","published":"2022-08-22T15:15:00Z","upstream":["CVE-2021-3521"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3521"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2021-3521"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3521"}],"affected":[{"package":{"name":"rpm","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-2","4.11.1-3","4.11.1-3ubuntu0.1","4.11.1-3ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"debugedit","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_version":"4.11.1-3ubuntu0.1+esm1","binary_name":"librpm3"},{"binary_name":"librpmbuild3","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_name":"librpmio3","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_name":"librpmsign1","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_version":"4.11.1-3ubuntu0.1+esm1","binary_name":"python-rpm"},{"binary_name":"rpm","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_name":"rpm-common","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_name":"rpm-i18n","binary_version":"4.11.1-3ubuntu0.1+esm1"},{"binary_name":"rpm2cpio","binary_version":"4.11.1-3ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0.1+dfsg1-3build2","4.12.0.1+dfsg1-3build3","4.12.0.1+dfsg1-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1","binary_name":"debugedit"},{"binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1","binary_name":"librpm3"},{"binary_name":"librpmbuild3","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_name":"librpmio3","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1","binary_name":"librpmsign3"},{"binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1","binary_name":"python-rpm"},{"binary_name":"python3-rpm","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_name":"rpm","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_name":"rpm-common","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_name":"rpm-i18n","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"},{"binary_name":"rpm2cpio","binary_version":"4.12.0.1+dfsg1-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0.2+dfsg1-2build2","4.14.0+dfsg1-2","4.14.1+dfsg1-2","4.14.1+dfsg1-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1","binary_name":"debugedit"},{"binary_name":"librpm8","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_name":"librpmbuild8","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_name":"librpmio8","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1","binary_name":"librpmsign8"},{"binary_name":"python-rpm","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_name":"python3-rpm","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_name":"rpm","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"},{"binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1","binary_name":"rpm-common"},{"binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1","binary_name":"rpm-i18n"},{"binary_name":"rpm2cpio","binary_version":"4.14.1+dfsg1-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.14.2.1+dfsg1-1","4.14.2.1+dfsg1-1build1","4.14.2.1+dfsg1-1build2","4.14.2.1+dfsg1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"debugedit"},{"binary_name":"librpm8","binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"librpmbuild8"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"librpmio8"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"librpmsign8"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"python-rpm"},{"binary_name":"python3-rpm","binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1"},{"binary_name":"rpm","binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"rpm-common"},{"binary_name":"rpm-i18n","binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1"},{"binary_version":"4.14.2.1+dfsg1-1ubuntu0.1~esm1","binary_name":"rpm2cpio"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.16.1.2+dfsg1-3ubuntu1","4.16.1.2+dfsg1-3ubuntu3","4.17.0+dfsg1-1","4.17.0+dfsg1-3","4.17.0+dfsg1-4","4.17.0+dfsg1-4build1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.17.0+dfsg1-4build1","binary_name":"librpm9"},{"binary_version":"4.17.0+dfsg1-4build1","binary_name":"librpmbuild9"},{"binary_name":"librpmio9","binary_version":"4.17.0+dfsg1-4build1"},{"binary_version":"4.17.0+dfsg1-4build1","binary_name":"librpmsign9"},{"binary_version":"4.17.0+dfsg1-4build1","binary_name":"python3-rpm"},{"binary_name":"rpm","binary_version":"4.17.0+dfsg1-4build1"},{"binary_name":"rpm-common","binary_version":"4.17.0+dfsg1-4build1"},{"binary_name":"rpm-i18n","binary_version":"4.17.0+dfsg1-4build1"},{"binary_version":"4.17.0+dfsg1-4build1","binary_name":"rpm2cpio"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.18.0+dfsg-1build1","4.18.0+dfsg-1build2","4.18.2+dfsg-1","4.18.2+dfsg-2","4.18.2+dfsg-2.1build1","4.18.2+dfsg-2.1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"librpm9t64","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_name":"librpmbuild9t64","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_name":"librpmio9t64","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_name":"librpmsign9t64","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_version":"4.18.2+dfsg-2.1build2","binary_name":"python3-rpm"},{"binary_name":"rpm","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_name":"rpm-common","binary_version":"4.18.2+dfsg-2.1build2"},{"binary_version":"4.18.2+dfsg-2.1build2","binary_name":"rpm-i18n"},{"binary_name":"rpm2cpio","binary_version":"4.18.2+dfsg-2.1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.1+dfsg-1","4.20.1+dfsg-2","4.20.1+dfsg-2build1","4.20.1+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_name":"librpm10","binary_version":"4.20.1+dfsg-3"},{"binary_name":"librpmbuild10","binary_version":"4.20.1+dfsg-3"},{"binary_name":"librpmio10","binary_version":"4.20.1+dfsg-3"},{"binary_version":"4.20.1+dfsg-3","binary_name":"librpmsign10"},{"binary_name":"python3-rpm","binary_version":"4.20.1+dfsg-3"},{"binary_name":"rpm","binary_version":"4.20.1+dfsg-3"},{"binary_name":"rpm-common","binary_version":"4.20.1+dfsg-3"},{"binary_name":"rpm-i18n","binary_version":"4.20.1+dfsg-3"},{"binary_version":"4.20.1+dfsg-3","binary_name":"rpm2cpio"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}},{"package":{"name":"rpm","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rpm?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.1+dfsg-3","6.0.0-2","6.0.1-1","6.0.1-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"librpm10","binary_version":"6.0.1-1build1"},{"binary_version":"6.0.1-1build1","binary_name":"librpmbuild10"},{"binary_name":"librpmio10","binary_version":"6.0.1-1build1"},{"binary_version":"6.0.1-1build1","binary_name":"librpmsign10"},{"binary_name":"python3-rpm","binary_version":"6.0.1-1build1"},{"binary_name":"rpm","binary_version":"6.0.1-1build1"},{"binary_name":"rpm-common","binary_version":"6.0.1-1build1"},{"binary_version":"6.0.1-1build1","binary_name":"rpm2cpio"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3521.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"negligible"}]}