CVE-2026-68508

HighCVSS 7.8

Published: 21/08/2026(UTC)Updated: 21/08/2026(UTC)Translated: 22/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.25%

17th percentile - higher than 17% of all known CVEs

Summary

Hydra before version 1.3.4 has an arbitrary code execution vulnerability. The hydra.utils.instantiate() function resolves and calls Python objects selected by configuration, allowing an attacker to invoke dangerous callables.

Risk Assessment

Applications using untrusted configuration or input can be exploited to execute malicious code, potentially leading to full system compromise.

Recommendation

Update Hydra to version 1.3.4 or later, which includes the fix.

Other vulnerabilities in Hydra

CVE-2026-56766High
A stack buffer overflow vulnerability in Hydra through version 9.7 (fixed in commit 9cc84c2) affects NTLM authentication in SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A remote server can send a crafted challenge with an excessively long domain string, causing base64-encoded response data to overflow a 500-byte stack buffer by 18 to 330 bytes, enabling remote code execution on systems without stack protection.

Original NVD description (English source)

Hydra is a framework for elegantly configuring complex applications. Prior to 1.3.4, hydra.utils.instantiate() resolves and calls Python objects selected by configuration through _resolve_target() in hydra/_internal/instantiate/_instantiate2.py, allowing attacker-controlled target values and arguments to choose dangerous callables. A consuming application, library, CLI workflow, or model loader that passes untrusted configuration, CLI overrides, or model metadata into hydra.utils.instantiate() can therefore execute arbitrary code in its own process, including reading or modifying files and credentials or terminating the process. Version 1.3.4 adds target blocking with an explicit HYDRA_INSTANTIATE_ALLOWLIST_OVERRIDE escape hatch. This issue is fixed in version 1.3.4.