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CVE-2026-97370

HIGH 7.5

Published 2026-10-15 · Last modified 2026-10-16

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.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 34th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

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Data snapshot:

Affected

Vendors Junrar

Products Junrar

Weakness (CWE)

  • CWE-835: : Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • com.github.junrar:junrar Maven

    pkg:maven/com.github.junrar/junrar

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 7.6.1
    28 explicitly listed affected versions

    0.7, 1.0.0, 1.0.1, 2.0.0, 3.0.0, 3.1.0, 4.0.0, 5.0.0, 6.0.0, 6.0.1, 7.0.0, 7.1.0, 7.2.0, 7.3.0, 7.4.0, 7.4.1, 7.5.0, 7.5.1, 7.5.10, 7.5.2, 7.5.3, 7.5.4, 7.5.5, 7.5.6, 7.5.7, 7.5.8, 7.5.9, 7.6.0

    Additional upstream package constraints
    {
  "database": {
    "last_known_affected_version_range": "<= 7.6.0",
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h9h9-2rmf-rvhp/GHSA-h9h9-2rmf-rvhp.json"
  }
}
    GitHub Advisory Database · GHSA-h9h9-2rmf-rvhp · Updated 2026-10-15T20:30:07.173215533Z

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS