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CVE-2026-54771 is an improper neutralization vulnerability in Langroid, a framework for building large-language-model-powered applications. In versions prior to 0.65.3, applications that expose a chat interface to untrusted users may permit direct invocation of tool handlers through raw JSON payloads. The issue occurs even when tools are registered with use=False, handle=True, meaning developers may believe those tools are not directly invocable by end users. The vulnerable behavior is attributed to insufficient verification of sender origin during message handling, allowing crafted chat input to reach handled tools directly. This can bypass intended application-level restrictions on which tools an untrusted chat user is allowed to trigger.
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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.
use=False, handle=True and validate that post-upgrade behavior matches intended access controls for untrusted chat users.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.
7 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.