TI-2026-74659 Aliases CVE-2026-97370 GHSA-h9h9-2rmf-rvhp

Infinite CPU loop in Junrar RAR4 extraction through RarVM jumps

LOW 39CWE-835Published 2026-10-15 · Updated 2026-10-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-835.

Summary

Junrar, a Java library for RAR archives, is affected before 7.6.1, including the Maven artifact com.github.junrar:junrar. The RarVM VM_JMP handler accepts jump targets past the code size without advancing or counting down, which is an infinite loop flaw (CWE-835). An unauthenticated remote attacker can supply a crafted RAR4 archive that keeps an extraction thread in an infinite CPU loop and exhausts archive-processing worker capacity. The impact is loss of availability only.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00402 34th percentileScored 2026-11-07

Fix Partial junrar (junrar): 7.6.1com.github.junrar:junrar (Maven): 7.6.1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
junrar	junrar	before 7.6.1	7.6.1	Patch available	CNA
—	com.github.junrar:junrar (Maven)	before 7.6.1	7.6.1	Patch available	GHSA-h9h9-2rmf-rvhp

junrar Vendorjunrar Affected before 7.6.1 Fixed in 7.6.1 Patch available CNA
com.github.junrar:junrar (Maven) Vendor— Affected before 7.6.1 Fixed in 7.6.1 Patch available GHSA-h9h9-2rmf-rvhp

Remediation

Upgrade Junrar to version 7.6.1, which fixes the flaw. Red Hat lists Red Hat Fuse 7 as affected with no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA junrar (junrar) Fixed in 7.6.1
Fix · GHSA-h9h9-2rmf-rvhp com.github.junrar:junrar (Maven) Fixed in 7.6.1 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Fuse 7	Affected	No fix yet

Timeline

2026-10-16 Threatist record created from CVE-2026-97370
2026-10-16 Alias added: GHSA-h9h9-2rmf-rvhp
2026-10-16 Priority changed: MEDIUM → LOW
2026-10-16 CISA SSVC decision points changed
2026-11-06 Affected versions changed · Red Hat
2026-11-06 CVSS score added · Red Hat

References

Other 4

TI-2026-58877 Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root CVSS 3.1LOW 3.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences