CVE-2026-6103 Affecting php-pecl-xdebug-debugsource package, versions <0:2.9.5-1.module+el8.10.0+1604+6558efc7


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-ROCKY8-PHPPECLXDEBUGDEBUGSOURCE-21439962
  • published23 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

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

How to fix?

Upgrade Rocky-Linux:8 php-pecl-xdebug-debugsource to version 0:2.9.5-1.module+el8.10.0+1604+6558efc7 or higher.
This issue was patched in RLSA-2026:87080.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-pecl-xdebug-debugsource package and not the php-pecl-xdebug-debugsource package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 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