{"id":"CVE-2026-8295","state":"PUBLISHED","title":"Integer overflow in simdjson","description":"An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in \"string_builder::escape_and_append()\" when processing very large input strings on platforms with limited \"size_t\" width (e.g., 32-bit builds). The overflow can cause insufficient buffer allocation, leading to out-of-bounds memory reads in SIMD routines and potentially resulting in information disclosure, memory corruption, or malformed JSON output.\nThis vulnerability has been fixed in 4.6.4 release","publishedAt":"2026-05-14T10:27:41.953Z","updatedAt":"2026-05-14T17:48:38.036Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","source":"CERT-PL"},"assigner":"CERT-PL","products":["simdjson simdjson"],"affected":[{"vendor":"simdjson","product":"simdjson","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.6.4","versionType":"semver"}],"modules":["string_builder"],"platforms":["32 bit"],"programFiles":["include/simdjson/generic/builder/json_string_builder-inl.h"],"repo":"https://github.com/simdjson/simdjson"}],"references":["https://github.com/simdjson/simdjson/releases/tag/v4.6.4","https://cert.pl/posts/2026/05/CVE-2026-8295"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8295.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8295","state":"PUBLISHED","datePublished":"2026-05-14T10:27:41.953Z","dateUpdated":"2026-05-14T17:48:38.036Z","assignerShortName":"CERT-PL","assignerOrgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateReserved":"2026-05-11T09:30:25.123Z"},"containers":{"cna":{"title":"Integer overflow in simdjson","descriptions":[{"lang":"en","value":"An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in \"string_builder::escape_and_append()\" when processing very large input strings on platforms with limited \"size_t\" width (e.g., 32-bit builds). The overflow can cause insufficient buffer allocation, leading to out-of-bounds memory reads in SIMD routines and potentially resulting in information disclosure, memory corruption, or malformed JSON output.\nThis vulnerability has been fixed in 4.6.4 release"}],"affected":[{"vendor":"simdjson","product":"simdjson","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.6.4","versionType":"semver"}],"modules":["string_builder"],"platforms":["32 bit"],"programFiles":["include/simdjson/generic/builder/json_string_builder-inl.h"],"repo":"https://github.com/simdjson/simdjson"}],"references":[{"url":"https://github.com/simdjson/simdjson/releases/tag/v4.6.4","tags":["release-notes"]},{"url":"https://cert.pl/posts/2026/05/CVE-2026-8295","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","description":"CWE-190 Integer Overflow or Wraparound","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERT-PL","orgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateUpdated":"2026-05-14T10:27:41.953Z"},"credits":[{"lang":"en","type":"finder","value":"Michał Majchrowicz (AFINE)"},{"lang":"en","type":"finder","value":"Marcin Wyczechowski (AFINE)"}],"datePublic":"2026-05-14T10:27:00.000Z","source":{"discovery":"EXTERNAL"},"tags":["x_open-source"],"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-14T17:48:20.702107Z","id":"CVE-2026-8295","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":"2026-05-14T17:48:38.036Z"}}]}}}