Is CVE-2026-45133 actively exploited?

No active exploitation of CVE-2026-45133 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45133 be exploited remotely?

Yes. CVE-2026-45133 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45133?

CVE-2026-45133 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-45133

HIGH

CVE-2026-45133

CWE-674Published: July 14, 2026· Updated: Jul 15, 2026

7.5

CVSS v3.1

EPSS:0.60%probability of exploitation in 30 daysPercentile:44.8th

Official Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

NVD Source

Technical Analysis

CVE-2026-45133 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.