{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"important"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2026-27624","title":"Title"},{"category":"description","text":"Coturn is a free open source implementation of TURN and STUN Server. Coturn is commonly configured to block loopback and internal ranges using \"denied-peer-ip\" and/or default loopback restrictions. CVE-2020-26262 addressed bypasses involving \"0.0.0.0\", \"[::1]\" and \"[::]\", but IPv4-mapped IPv6 is not covered. When sending a \"CreatePermission\" or \"ChannelBind\" request with the \"XOR-PEER-ADDRESS\" value of \"::ffff:127.0.0.1\", a successful response is received, even though \"127.0.0.0/8\" is blocked via \"denied-peer-ip\". The root cause is that, prior to the updated fix implemented in version 4.9.0, three functions in \"src/client/ns_turn_ioaddr.c\" do not check \"IN6_IS_ADDR_V4MAPPED\". \"ioa_addr_is_loopback()\" checks \"127.x.x.x\" (AF_INET) and \"::1\" (AF_INET6), but not \"::ffff:127.0.0.1.\" \"ioa_addr_is_zero()\" checks \"0.0.0.0\" and \"::\", but not \"::ffff:0.0.0.0.\" \"addr_less_eq()\" used by \"ioa_addr_in_range()\" for \"denied-peer-ip\" matching: when the range is AF_INET and the peer is AF_INET6, the comparison returns 0 without extracting the embedded IPv4. Version 4.9.0 contains an updated fix to address the bypass of the fix for CVE-2020-26262.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2026-27624","url":"https://www.suse.com/security/cve/CVE-2026-27624"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1180764 for CVE-2026-27624","url":"https://bugzilla.suse.com/1180764"}],"title":"SUSE CVE CVE-2026-27624","tracking":{"current_release_date":"2026-03-16T08:39:01Z","generator":{"date":"2026-02-26T00:24:48Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2026-27624","initial_release_date":"2026-02-26T00:24:48Z","revision_history":[{"date":"2026-02-26T00:24:48Z","number":"2","summary":"references added,severity changed from  to important"},{"date":"2026-03-16T08:39:01Z","number":"3","summary":"vulnerabilities added"}],"status":"interim","version":"3"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_name","name":"openSUSE Tumbleweed","product":{"name":"openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed","product_identification_helper":{"cpe":"cpe:/o:opensuse:tumbleweed"}}},{"category":"product_version","name":"coturn-4.9.0-1.1","product":{"name":"coturn-4.9.0-1.1","product_id":"coturn-4.9.0-1.1","product_identification_helper":{"cpe":"cpe:2.3:a:coturn_project:coturn:4.9.0:*:*:*:*:*:*:*","purl":"pkg:rpm/suse/coturn@4.9.0-1.1"}}},{"category":"product_version","name":"coturn-devel-4.9.0-1.1","product":{"name":"coturn-devel-4.9.0-1.1","product_id":"coturn-devel-4.9.0-1.1","product_identification_helper":{"purl":"pkg:rpm/suse/coturn-devel@4.9.0-1.1"}}},{"category":"product_version","name":"coturn-utils-4.9.0-1.1","product":{"name":"coturn-utils-4.9.0-1.1","product_id":"coturn-utils-4.9.0-1.1","product_identification_helper":{"purl":"pkg:rpm/suse/coturn-utils@4.9.0-1.1"}}}],"category":"product_family","name":"SUSE Linux Enterprise"}],"category":"vendor","name":"SUSE"}],"relationships":[{"category":"default_component_of","full_product_name":{"name":"coturn-4.9.0-1.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:coturn-4.9.0-1.1"},"product_reference":"coturn-4.9.0-1.1","relates_to_product_reference":"openSUSE Tumbleweed"},{"category":"default_component_of","full_product_name":{"name":"coturn-devel-4.9.0-1.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:coturn-devel-4.9.0-1.1"},"product_reference":"coturn-devel-4.9.0-1.1","relates_to_product_reference":"openSUSE Tumbleweed"},{"category":"default_component_of","full_product_name":{"name":"coturn-utils-4.9.0-1.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:coturn-utils-4.9.0-1.1"},"product_reference":"coturn-utils-4.9.0-1.1","relates_to_product_reference":"openSUSE Tumbleweed"}]},"vulnerabilities":[{"cve":"CVE-2026-27624","ids":[{"system_name":"SUSE CVE Page","text":"https://www.suse.com/security/cve/CVE-2026-27624"}],"notes":[{"category":"general","text":"Coturn is a free open source implementation of TURN and STUN Server. Coturn is commonly configured to block loopback and internal ranges using \"denied-peer-ip\" and/or default loopback restrictions. CVE-2020-26262 addressed bypasses involving \"0.0.0.0\", \"[::1]\" and \"[::]\", but IPv4-mapped IPv6 is not covered. When sending a \"CreatePermission\" or \"ChannelBind\" request with the \"XOR-PEER-ADDRESS\" value of \"::ffff:127.0.0.1\", a successful response is received, even though \"127.0.0.0/8\" is blocked via \"denied-peer-ip\". The root cause is that, prior to the updated fix implemented in version 4.9.0, three functions in \"src/client/ns_turn_ioaddr.c\" do not check \"IN6_IS_ADDR_V4MAPPED\". \"ioa_addr_is_loopback()\" checks \"127.x.x.x\" (AF_INET) and \"::1\" (AF_INET6), but not \"::ffff:127.0.0.1.\" \"ioa_addr_is_zero()\" checks \"0.0.0.0\" and \"::\", but not \"::ffff:0.0.0.0.\" \"addr_less_eq()\" used by \"ioa_addr_in_range()\" for \"denied-peer-ip\" matching: when the range is AF_INET and the peer is AF_INET6, the comparison returns 0 without extracting the embedded IPv4. Version 4.9.0 contains an updated fix to address the bypass of the fix for CVE-2020-26262.","title":"CVE description"}],"product_status":{"recommended":["openSUSE Tumbleweed:coturn-4.9.0-1.1","openSUSE Tumbleweed:coturn-devel-4.9.0-1.1","openSUSE Tumbleweed:coturn-utils-4.9.0-1.1"]},"references":[{"category":"external","summary":"CVE-2026-27624","url":"https://www.suse.com/security/cve/CVE-2026-27624"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1180764 for CVE-2026-27624","url":"https://bugzilla.suse.com/1180764"}],"remediations":[{"category":"vendor_fix","details":"To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n","product_ids":["openSUSE Tumbleweed:coturn-4.9.0-1.1","openSUSE Tumbleweed:coturn-devel-4.9.0-1.1","openSUSE Tumbleweed:coturn-utils-4.9.0-1.1"]}],"scores":[{"cvss_v3":{"baseScore":6.5,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"products":["openSUSE Tumbleweed:coturn-4.9.0-1.1","openSUSE Tumbleweed:coturn-devel-4.9.0-1.1","openSUSE Tumbleweed:coturn-utils-4.9.0-1.1"]}],"threats":[{"category":"impact","date":"2021-01-12T08:18:07Z","details":"important"}],"title":"CVE-2026-27624"}]}