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Advisory record · GHSA-m49c-g9wr-hv6v

jinjava has Sandbox Bypass via JavaType-Based Deserialization

CVSS 9.8 CriticalCriticalEPSS 0.022 · 82nd percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 17 Sept 2025, 19:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.hubspot.jinjava:jinjavaMaven>=2.8.0, <2.8.1 || >=2.7.0, <2.7.52.8.1, 2.7.5
Identifiers
GHSA-m49c-g9wr-hv6v · CVE-2025-59340
Weakness (CWE)
CWE-1336
Tags
Published
17 Sept 2025
Updated
31 Jul 2026

Machine-written summary

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

Jinjava versions 2.8.0 before 2.8.1 and 2.7.0 before 2.7.5 (Maven com.hubspot.jinjava:jinjava) contain a sandbox bypass. An attacker who can supply template content can use JavaType-based deserialization to instantiate arbitrary classes, which can read local files, perform server-side requests, and possibly lead to remote code execution. Upgrade to version 2.8.1 or 2.7.5. The source gives few details on the exact attack conditions.

Written 2 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
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.022, the 82nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.