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Advisory record · GHSA-7xcv-9j6c-2fmc

Modular Max Serve has Unsafe Deserialization vulnerability

CVSS 8.4 HighEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 18 Nov 2025, 21:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
modularPyPI<25.6.025.6.0
Identifiers
GHSA-7xcv-9j6c-2fmc · CVE-2025-60455 · PYSEC-2025-253 · PYSEC-2026-427
Weakness (CWE)
CWE-502
Tags
Published
18 Nov 2025
Updated
13 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Modular Max Serve versions before 25.6 (PyPI package modular, fixed in 25.6.0) contain an unsafe deserialization flaw that only affects deployments using the "--experimental-enable-kvcache-agent" option. The source gives few details on how the attack is delivered. A successful attacker could execute arbitrary code. Upgrade the modular package to 25.6.0 or later; if you cannot upgrade, do not enable the "--experimental-enable-kvcache-agent" option.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.4 High 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 18 Nov 2025, 19:15 UTC Confirmed by NVD
  2. 31 Oct 2026, 15:04 UTC First seen by agentprime
  3. 31 Oct 2026, 15:04 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.