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Anthropic's Mythos AI aids discovery of critical HFS vulnerability, now actively exploited

By PulseAugur Editorial · [1 sources] ·

Attackers are actively exploiting a critical vulnerability, CVE-2026-61500, in the Rejetto HTTP File Server (HFS) just one day after its details were published. The flaw, discovered with the help of Anthropic's AI model Mythos, allows attackers to forge administrator credentials and execute arbitrary code on affected servers. While HFS version 3.2.1 provides a fix, the vulnerability highlights the risks of using predictable random number generators for security-sensitive operations in JavaScript, with researchers recommending the use of more secure alternatives like crypto.randomBytes(). AI

IMPACT Highlights the real-world impact of AI in vulnerability discovery and the subsequent race between exploitation and patching.

RANK_REASON The cluster describes the exploitation of a specific software vulnerability, which is a security tool issue, rather than a frontier model release or significant industry event.

Read on dev.to — Anthropic tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's Mythos AI aids discovery of critical HFS vulnerability, now actively exploited

How we ranked this

Signal score
17 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The cluster describes the exploitation of a specific software vulnerability, which is a security tool issue, rather than a frontier model release or significant industry event.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
safety, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — Anthropic tag TIER_1 English(EN) · techaiwire ·

    Rejetto HFS CVE-2026-61500 exploited a day after write-up

    <p>Attackers began exploiting CVE-2026-61500, a critical flaw in the Rejetto HFS file server, on October 3, 2026. That was one day after Horizon3.ai published how it works, <a href="https://www.theregister.com/security/2026/10/03/anthropics-super-bug-hunting-model-mythos-is-hardc…

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