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CVE-2026-12184 is a high-impact vulnerability in PHP’s HTTP stream wrapper implementation. The flaw is triggered during HTTP connection handling when Transport Layer Security initialization fails. In the vulnerable logic, PHP closes and resets the internal stream object after the TLS setup failure, but subsequent cleanup code continues to operate as though the stream object remains valid. This results in unsafe operations on a null reference and can crash the PHP process handling the request. The issue affects PHP versions earlier than 8.3.32, 8.4.21, and 8.5.6.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.