CVE-2026-6103 Affecting php8-bcmath package, versions <8.0.30-150400.4.76.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-SLES154-PHP8BCMATH-20968759
  • published15 Oct 2026
  • disclosed13 Oct 2026

Introduced: 13 Oct 2026

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

How to fix?

Upgrade SLES:15.4 php8-bcmath to version 8.0.30-150400.4.76.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php8-bcmath package and not the php8-bcmath package as distributed by SLES. See How to fix? for SLES:15.4 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