High 7.5Published Oct 15, 2026

CVE-2026-97370Junrar: RarVM VM_JMP maxOpCount bypass causes infinite CPU loop during RAR4 extraction

Updated under an hour ago (2026-10-19 09:40 UTC)

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EPSS puts the chance of exploitation in the next 30 days at 0.40%, higher than 33% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.40% (percentile 33)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

junrar junrar junrar:junrar (from the name)	before 7.6.1	CNA record

References

https://github.com/junrar/junrar/security/advisories/GHSA-h9h9-2rmf-rvhpx-refsource-confirm
https://github.com/junrar/junrar/commit/687a09c42f46066447faa9179ee11314ad6d9afbx-refsource-misc
https://github.com/junrar/junrar/releases/tag/v7.6.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.