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CVE-2026-12184 is a null pointer dereference vulnerability in PHP’s HTTP stream wrapper during HTTP connection handling. When TLS initialization fails, PHP closes and resets the internal stream object but continues cleanup operations that assume the object remains valid. An unauthenticated remote attacker can trigger the failure through TLS validation errors, such as an expired certificate or mismatched peer name, potentially crashing PHP-FPM and disrupting service. Affected PHP branches have fixes in versions 8.3.32, 8.4.21, and 8.5.6.
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What an attacker gets, and what they’ve been doing with it.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A PHP vulnerability referenced as addressed by the rebase to PHP 8.3.32 for Red Hat Enterprise Linux 9.8.z. The content does not describe its technical cause or impact.
A high-impact denial-of-service vulnerability in PHP’s HTTP stream wrapper caused by improper cleanup after TLS initialization failure, leading to unsafe operations on a null reference and potential PHP-FPM worker termination.
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.