{"id":"CVE-2026-50643","state":"PUBLISHED","title":"Out‑of‑Bounds Read in 8cc","description":"8cc is vulnerable to an Out‑of‑Bounds Read due to improper handling of #line directives and GNU linemarkers. The compiler accepts attacker-controlled filename and line number metadata and later uses it without validation when accessing source line arrays.\nBy supplying invalid or oversized line numbers, an attacker can trigger out-of-bounds memory access and a crash.\n\nMaintainer of this project was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Version corresponding to the commit b480958 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.","publishedAt":"2026-06-18T08:58:01.908Z","updatedAt":"2026-06-18T12:29:43.415Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","source":"CERT-PL"},"assigner":"CERT-PL","products":["rui314 8cc"],"affected":[{"vendor":"rui314","product":"8cc","defaultStatus":"unknown","versions":[{"version":"b480958","status":"affected","versionType":"custom"}],"repo":"https://github.com/rui314/8cc"}],"references":["https://cert.pl/en/posts/2026/06/CVE-2026-50641","https://github.com/rui314/8cc"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/50xxx/CVE-2026-50643.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-50643","state":"PUBLISHED","datePublished":"2026-06-18T08:58:01.908Z","dateUpdated":"2026-06-18T12:29:43.415Z","assignerShortName":"CERT-PL","assignerOrgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateReserved":"2026-06-05T13:27:10.270Z"},"containers":{"cna":{"title":"Out‑of‑Bounds Read in 8cc","descriptions":[{"lang":"en","value":"8cc is vulnerable to an Out‑of‑Bounds Read due to improper handling of #line directives and GNU linemarkers. The compiler accepts attacker-controlled filename and line number metadata and later uses it without validation when accessing source line arrays.\nBy supplying invalid or oversized line numbers, an attacker can trigger out-of-bounds memory access and a crash.\n\nMaintainer of this project was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Version corresponding to the commit b480958 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable."}],"affected":[{"vendor":"rui314","product":"8cc","defaultStatus":"unknown","versions":[{"version":"b480958","status":"affected","versionType":"custom"}],"repo":"https://github.com/rui314/8cc"}],"references":[{"url":"https://cert.pl/en/posts/2026/06/CVE-2026-50641","tags":["third-party-advisory"]},{"url":"https://github.com/rui314/8cc","tags":["product"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERT-PL","orgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateUpdated":"2026-06-18T08:58:01.908Z"},"credits":[{"lang":"en","type":"finder","value":"Michal Majchrowicz (AFINE)"},{"lang":"en","type":"finder","value":"Marcin Wyczechowski (AFINE)"}],"impacts":[{"capecId":"CAPEC-540","descriptions":[{"lang":"en","value":"CAPEC-540 Overread Buffers"}]}],"source":{"discovery":"EXTERNAL"},"tags":["x_open-source","unsupported-when-assigned"],"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-18T12:17:47.845488Z","id":"CVE-2026-50643","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-18T12:29:43.415Z"}}]}}}