{"id":"CVE-2026-73523","state":"PUBLISHED","title":"COVESA Open1722 0.9.2 Stack Memory Disclosure via acf-can-listener.c Integer Truncation","description":"COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in acf-can-listener.c that allows unauthenticated remote attackers to cause the CAN listener to transmit process stack memory onto the CAN bus by sending a rejected UDP datagram with a matching AVTP stream ID. The num_can_msgs variable declared as uint8_t truncates the -1 error return value from avtp_to_can() to 255, causing a write loop to iterate 255 times over a 15-slot stack array and leak approximately 18 KB of adjacent stack memory as roughly 240 CAN frames to any recipient on the CAN bus.","publishedAt":"2026-08-17T18:00:01.521Z","updatedAt":"2026-08-17T18:12:52.559Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["COVESA Open1722"],"affected":[{"vendor":"COVESA","product":"Open1722","packageURL":"pkg:github/COVESA/Open1722","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.9.2","versionType":"semver"}],"repo":"https://github.com/COVESA/Open1722"}],"references":["https://github.com/COVESA/Open1722/issues/154","https://www.vulncheck.com/advisories/covesa-open1722-stack-memory-disclosure-via-acf-can-listener-c-integer-truncation"],"weaknesses":["CWE-197"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73523.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73523","state":"PUBLISHED","datePublished":"2026-08-17T18:00:01.521Z","dateUpdated":"2026-08-17T18:12:52.559Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-12T19:29:19.866Z"},"containers":{"cna":{"title":"COVESA Open1722 0.9.2 Stack Memory Disclosure via acf-can-listener.c Integer Truncation","descriptions":[{"lang":"en","value":"COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in acf-can-listener.c that allows unauthenticated remote attackers to cause the CAN listener to transmit process stack memory onto the CAN bus by sending a rejected UDP datagram with a matching AVTP stream ID. The num_can_msgs variable declared as uint8_t truncates the -1 error return value from avtp_to_can() to 255, causing a write loop to iterate 255 times over a 15-slot stack array and leak approximately 18 KB of adjacent stack memory as roughly 240 CAN frames to any recipient on the CAN bus."}],"affected":[{"vendor":"COVESA","product":"Open1722","packageURL":"pkg:github/COVESA/Open1722","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.9.2","versionType":"semver"}],"repo":"https://github.com/COVESA/Open1722"}],"references":[{"url":"https://github.com/COVESA/Open1722/issues/154","name":"Researcher Disclosure","tags":["issue-tracking"]},{"url":"https://www.vulncheck.com/advisories/covesa-open1722-stack-memory-disclosure-via-acf-can-listener-c-integer-truncation","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-197","lang":"en","description":"Numeric Truncation Error","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-17T18:00:01.521Z"},"tags":["x_open-source"],"datePublic":"2026-08-13T00:00:00.000Z","credits":[{"lang":"en","value":"Fatullayev Asadbek","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-17T18:12:35.922686Z","id":"CVE-2026-73523","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-17T18:12:52.559Z"}}]}}}