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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2026-6103

LOW 3.3 CVSS 3.1
Published
September 25, 2026
Last modified
October 23, 2026
NVD status
Analyzed
Reported by
security@php.net
Weakness
CWE-190
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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.

Affected products and versions

  • PHP — From 8.2.0 (including) to 8.2.34 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.35 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.26 (excluding)
  • PHP — From 8.5.0 (including) to 8.5.11 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85 Vendor Advisory, Exploit
  • nvd.nist.gov Official NVD record