{"id":"CVE-2026-6103","revision":"ba0668db4a4a4c1c92a1e58abd09b72e","records":[{"revision":"ba0668db4a4a4c1c92a1e58abd09b72e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-6103","aliases":[],"title":"Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection","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.","state":0,"publishedAt":"2026-09-25T20:08:49.333+00:00","modifiedAt":"2026-09-25T20:41:27.115+00:00","affected":[{"ecosystem":"Vendor product","name":"PHP","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"PHP Group\",\n                    \"product\": \"PHP\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.2.*\",\n                            \"lessThan\": \"8.2.34\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.3.*\",\n                            \"lessThan\": \"8.3.35\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.4.*\",\n                            \"lessThan\": \"8.4.26\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.5.*\",\n                            \"lessThan\": \"8.5.11\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6103","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6103","identifiers":["CVE-2026-6103"]},"retained":false,"historicalAffected":[]}],"coverage":[]}