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PYSEC-2026-427

Modular Max Serve has Unsafe Deserialization vulnerability

Details

Unsafe Deserialization vulnerability in Modular Max Serve before 25.6, specifically when the "--experimental-enable-kvcache-agent" feature is used allowing attackers to execute arbitrary code.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / modular

Introduced in: 0 Fixed in: 25.6.0

Fix pip install --upgrade 'modular>=25.6.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2025-60455 [ADVISORY]
https://github.com/modular/modular/issues/4795 [WEB]
https://github.com/modular/modular/commit/10620059fb5c47fb0c30e5d21a8ff3b8d622fba4 [WEB]
https://github.com/modular/modular/commit/b20e749fa892dbe772e890a268002f732164d9f5 [WEB]
https://github.com/modular/modular/commit/ee9c4ab02345dd30bed8b79771b6909ff1b930a1 [WEB]
https://github.com/modular/modular [PACKAGE]
https://github.com/modular/modular/blame/main/max/serve/kvcache_agent/kvcache_agent.py#L220 [WEB]
https://www.oligo.security/blog/shadowmq-how-code-reuse-spread-critical-vulnerabilities-across-the-ai-ecosystem [WEB]
https://pypi.org/project/modular [PACKAGE]
https://github.com/advisories/GHSA-7xcv-9j6c-2fmc [ADVISORY]