CVE-2026-6103
phar_tar_number() parses the octal size field of a TAR header into a uint32_t with no overflow check.
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
Description
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 3.1
- 3.3 LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.16% probability · 5th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- php/php
- Source
- security@php.net
EPSS moved from 0.2% on 26 September 2026 to 0.2% on 26 October 2026.
References
- https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85Vendor Advisory, Exploit
- https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85Vendor Advisory, Exploit
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.