{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/hydra-core-1.3.3-and-earlier/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.8,"id":"CVE-2026-68508"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["hydra-core (1.3.3 and earlier)"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["Meta"],"content_html":"\u003cp\u003eHydra is a framework used primarily for configuring complex applications, often in the machine learning and research domains. The library provides the \u003ccode\u003ehydra.utils.instantiate()\u003c/code\u003e function, which is designed to dynamically resolve and instantiate Python objects based on provided configuration structures. The vulnerability exists because \u003ccode\u003einstantiate()\u003c/code\u003e acts as a powerful object-construction engine; when a consuming application passes untrusted or semi-trusted configuration - such as model metadata or user-supplied CLI overrides - directly to this function, an attacker who can control the \u003ccode\u003e_target_\u003c/code\u003e field within the configuration can force the application to instantiate arbitrary Python callables. This facilitates arbitrary code execution within the security context of the parent process. This vulnerability (CVE-2026-68508) is a design-level risk common in frameworks that provide recursive instantiation capabilities without default sandboxing or strict allowlisting. Users are advised to upgrade to version 1.3.4, which introduces a blacklist for dangerous targets, or to migrate to the allowlist-based model found in the 1.4 development branch.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies an application or research tool that consumes external data (e.g., model metadata or config files) and uses Hydra to process it.\u003c/li\u003e\n\u003cli\u003eAttacker prepares a malicious configuration file containing a crafted \u003ccode\u003e_target_\u003c/code\u003e key targeting a dangerous Python callable.\u003c/li\u003e\n\u003cli\u003eAttacker triggers the application to load the malicious configuration (e.g., via file upload, model import, or CLI argument).\u003c/li\u003e\n\u003cli\u003eThe application reads the external data and passes the dictionary structure into \u003ccode\u003ehydra.utils.instantiate()\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eHydra resolves the malicious \u003ccode\u003e_target_\u003c/code\u003e string into a Python class or function pointer.\u003c/li\u003e\n\u003cli\u003eHydra invokes the callable with the attacker-controlled arguments provided in the configuration.\u003c/li\u003e\n\u003cli\u003eThe target callable executes, leading to arbitrary system commands or unauthorized logic execution within the host process.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows for execution of code within the privileges of the target process. This may result in unauthorized access to sensitive data (e.g., environment variables, API keys, training data), unauthorized modification of file systems, or process disruption. The severity is dependent on the role of the process - services running with elevated privileges or on sensitive infrastructure face the highest risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the \u003ccode\u003ehydra-core\u003c/code\u003e package to version 1.3.4 or higher to benefit from the built-in blacklist of dangerous targets (CVE-2026-68508).\u003c/li\u003e\n\u003cli\u003eFor applications handling untrusted inputs, implement a strict application-side allowlist for \u003ccode\u003e_target_\u003c/code\u003e keys before passing data to \u003ccode\u003ehydra.utils.instantiate()\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eAudit application code to identify call sites where external data, CLI overrides, or user-provided configuration files reach the \u003ccode\u003einstantiate()\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eMonitor for anomalous file access or network connections originating from AI/ML research pipelines or model-loading services.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-22T01:17:02Z","date_published":"2026-08-22T01:17:02Z","id":"https://feed.craftedsignal.io/briefs/2026-08-hydra-rce/","summary":"The hydra.utils.instantiate() function in hydra-core versions 1.3.3 and below is vulnerable to arbitrary code execution when processing untrusted configuration input, allowing attackers to hijack object instantiation.","title":"Arbitrary Code Execution via hydra.utils.instantiate","url":"https://feed.craftedsignal.io/briefs/2026-08-hydra-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - Hydra-Core (1.3.3 and Earlier)","version":"https://jsonfeed.org/version/1.1"}