Full Report
Hasn't released it to the public, because it would break the internet - in a bad way For years, the infosec community’s biggest existential worry has been quantum computers blowing away all classical encryption and revealing the world’s secrets. Now they have a new Big Bad: an AI model that can generate zero-day vulnerabilities.…
Analysis Summary
# Vulnerability: Anthropic Mythos - Autonomous Zero-Day Generation Engine
## CVE Details
- **CVE ID**: N/A (General threat report covering thousands of newly identified vulnerabilities)
- **CVSS Score**: 10.0 (Critical - theoretical maximum based on capabilities)
- **CWE**: Multiple (Including CWE-119: Memory Corruption, CWE-362: Race Conditions, CWE-821: Synchronization Errors)
## Affected Systems
- **Products**: Major operating systems (Linux, OpenBSD, FreeBSD, Windows/macOS implied), major web browsers, and enterprise network infrastructure.
- **Versions**: All current versions prior to April 2026; specifically notes flaws existing for up to 27 years.
- **Configurations**: Default configurations of FreeBSD NFS servers, standard web browser sandboxes, and kernels utilizing KASLR.
## Vulnerability Description
Anthropic's "Mythos" is a specialized Large Language Model (LLM) capable of autonomous vulnerability research and exploit development. Unlike previous models, Mythos demonstrates a 72.4% success rate in generating working exploits. Technical capabilities revealed include:
- **Complex Chaining**: Ability to chain four distinct vulnerabilities to achieve sandbox escapes.
- **Heap Manipulation**: Automated generation of JIT heap sprays.
- **Bypass Techniques**: Autonomous discovery of KASLR (Kernel Address Space Layout Randomization) bypasses and race conditions.
- **Network Exploitation**: Construction of multi-packet ROP (Return-Oriented Programming) chains to achieve unauthenticated Root RCE on FreeBSD NFS servers.
## Exploitation
- **Status**: PoCs generated internally by Anthropic; vulnerabilities currently being disclosed responsibly to vendors. No known "in-the-wild" exploitation by third parties yet.
- **Complexity**: Low (For the user of the AI model); High (For the underlying technical flaws).
- **Attack Vector**: Network (Remote Code Execution) and Local (Privilege Escalation).
## Impact
- **Confidentiality**: Total (Full system access, root-level permissions).
- **Integrity**: Total (Ability to modify OS kernels and application data).
- **Availability**: Total (Ability to crash or seize control of critical infrastructure).
## Remediation
### Patches
Anthropic is currently engaged in a mass-disclosure process with vendors. Users should monitor updates for:
- **OpenBSD**: Patch released for a 27-year-old SACK bug (hxxps[://]ftp[.]openbsd[.]org/pub/OpenBSD/patches/7.8/common/025_sack[.]patch[.]sig).
- **FreeBSD**: Watch for updates regarding NFS server RCE.
- **Major Browsers**: Implement all security updates immediately as they are released in Q2 2026.
### Workarounds
- Participate in **Project Glasswing**: Large enterprises and open-source projects can apply for access to Mythos Preview to identify flaws before they are weaponized.
- **Defense in Depth**: Robust network segmentation to limit the reach of RCE exploits discovered by the model.
## Detection
- **Indicators of Compromise**: No specific file-based signatures. Look for sophisticated multi-packet network traffic aimed at service ports (e.g., NFS) and unusual JIT memory allocations in browsers.
- **Detection Methods**: Use of AI-augmented static and dynamic analysis tools to identify the "subtle" flaws Mythos targets.
## References
- Anthropic Red Team Report: hxxps[://]red[.]anthropic[.]com/2026/mythos-preview/
- Project Glasswing: hxxps[://]www[.]anthropic[.]com/glasswing
- Leaked Technical Details: hxxps[://]m1astra-mythos[.]pages[.]dev/