CVE-2026-6103 Affecting php85 package, versions <8.5.11-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-ALPINE324-PHP85-20146793
  • published26 Sept 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-6103  (opens in a new tab)

How to fix?

Upgrade Alpine:3.24 php85 to version 8.5.11-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php85 package and not the php85 package as distributed by Alpine. See How to fix? for Alpine:3.24 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1