{"id":"UBUNTU-CVE-2026-56787","details":"RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.","modified":"2026-06-29T23:19:15.855252222Z","published":"2026-06-25T19:16:00Z","upstream":["CVE-2026-56787"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56787"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-56787"},{"type":"REPORT","url":"https://github.com/tomojitakasu/RTKLIB/issues/798"}],"affected":[{"package":{"name":"rtklib","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3+dfsg1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.3+dfsg1-1","binary_name":"rtklib"},{"binary_name":"rtklib-qt","binary_version":"2.4.3+dfsg1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}},{"package":{"name":"rtklib","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3+dfsg1-1","2.4.3+dfsg1-2.1","2.4.3+dfsg1-2.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"rtklib","binary_version":"2.4.3+dfsg1-2.1build1"},{"binary_name":"rtklib-qt","binary_version":"2.4.3+dfsg1-2.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}},{"package":{"name":"rtklib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3+dfsg1-2.1build1","2.4.3.b34+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librtklib1","binary_version":"2.4.3.b34+dfsg-1"},{"binary_name":"rtklib","binary_version":"2.4.3.b34+dfsg-1"},{"binary_name":"rtklib-qt","binary_version":"2.4.3.b34+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}},{"package":{"name":"rtklib","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3.b34+dfsg-1","2.4.3.b34+dfsg-1build1","2.4.3.b34+dfsg-1build2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.3.b34+dfsg-1build2","binary_name":"librtklib1"},{"binary_name":"rtklib","binary_version":"2.4.3.b34+dfsg-1build2"},{"binary_name":"rtklib-qt","binary_version":"2.4.3.b34+dfsg-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}},{"package":{"name":"rtklib","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3.b34+dfsg-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"librtklib1","binary_version":"2.4.3.b34+dfsg-1build2"},{"binary_name":"rtklib","binary_version":"2.4.3.b34+dfsg-1build2"},{"binary_version":"2.4.3.b34+dfsg-1build2","binary_name":"rtklib-qt"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}},{"package":{"name":"rtklib","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rtklib?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3.b34+dfsg-1build2","2.4.3.b34+dfsg-1build3"],"ecosystem_specific":{"binaries":[{"binary_name":"librtklib1","binary_version":"2.4.3.b34+dfsg-1build3"},{"binary_name":"rtklib","binary_version":"2.4.3.b34+dfsg-1build3"},{"binary_name":"rtklib-qt","binary_version":"2.4.3.b34+dfsg-1build3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56787.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}