CVE-2026-6103 Affecting php7.2 package, versions <7.2.24-0ubuntu0.18.04.17+esm13


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-UBUNTU1804-PHP72-20126093
  • published7 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

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

How to fix?

Upgrade Ubuntu:18.04 php7.2 to version 7.2.24-0ubuntu0.18.04.17+esm13 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php7.2 package and not the php7.2 package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 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