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Advisory record · GHSA-h9h9-2rmf-rvhp

Junrar: RarVM VM_JMP maxOpCount bypass causes infinite CPU loop during RAR4 extraction

CVSS 7.5 HighEPSS 0.0040 · 34th percentile

Published by the GitHub Advisory Database at 15 Oct 2026, 20:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.github.junrar:junrarMaven<7.6.17.6.1
Identifiers
GHSA-h9h9-2rmf-rvhp · CVE-2026-97370
Weakness (CWE)
CWE-835
Tags
Published
15 Oct 2026
Updated
15 Oct 2026

Machine-written summary

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

Junrar versions before 7.6.1 can enter an infinite loop when extracting a specially crafted RAR4 archive, because the RAR virtual machine's jump handling bypasses its operation limit. An attacker who can supply an archive to an application that calls Junrar's extract function can keep an extraction thread running indefinitely, causing a denial of service with no code execution. Upgrade to Junrar 7.6.1 or later.

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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.