{"id":"CVE-2026-6103","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-6103","generatedAt":"2026-10-28T01:50:56.690Z","title":"phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check.","description":"phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check. The field is 11 octal digits wide and holds values up to 0x1FFFFFFFF, so a size above 0xFFFFFFFF silently wraps. The parser then skips the wrong number of data blocks and interprets attacker-controlled file content as the next TAR header, which lets a crafted archive inject entries that PharData reports and extracts as if they were genuine.","published":"2026-09-25T21:17:24.000Z","lastModified":"2026-10-23T14:07:18.000Z","status":"Analyzed","sourceIdentifier":"security@php.net","cvss":{"version":"3.1","score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-190"],"affected":["php/php"],"epss":{"score":0.0016,"percentile":0.051,"date":"2026-10-26","history":[{"date":"2026-09-26","score":0.00167,"percentile":0.05316}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-23T16:15:26.000Z","detail":{"from":"4.3","score":"3.3","severity":"LOW","fromSeverity":"MEDIUM"},"summary":"Now scored CVSS 3.3 LOW (was 4.3)."},{"kind":"new","label":"New CVE","at":"2026-09-25T21:17:24.000Z","detail":{"score":"4.3","severity":"MEDIUM","publishedAt":"2026-09-25T21:17:23.790Z"},"summary":"New CVE, low severity (CVSS 3.3)."}],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":["Vendor Advisory","Exploit"],"source":"security@php.net"},{"url":"https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85","tags":["Vendor Advisory","Exploit"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-6103","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}