CVE-2026-6103 Affecting php8.2 package, versions <8.2.34-1~deb12u1


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-ECHOLATEST-PHP82-20079326
  • published24 Sept 2026
  • disclosed25 Sept 2026

Introduced: 24 Sep 2026

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

How to fix?

Upgrade Echo:latest php8.2 to version 8.2.34-1~deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php8.2 package and not the php8.2 package as distributed by Echo. See How to fix? for Echo:latest 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