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TI-2020-16883 Aliases CVE-2020-27801GHSA-hrvc-4vxq-q985

A heap-based buffer over-read was discovered in the get_le64 function in bele.h in UPX 4.0.0 via a crafted Mach-O file.

Priority LOW 34CWE-119Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A heap-based buffer over-read was discovered in the get_le64 function in bele.h in UPX 4.0.0 via a crafted Mach-O file.

Why it matters now

EPSS 0.00379 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—upxupx 4.0.0-git-87b73e5cfdc1+—No fix listedCNA
  • upx Vendor— Affected upx 4.0.0-git-87b73e5cfdc1+ Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:upx:upx:4.0.0:*:*:*:*:*:*:*4.0.0VulnerableUpx
  • cpe:2.3:a:upx:upx:4.0.0:*:*:*:*:*:*:* Versions 4.0.0 Vulnerable ·Upx

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27801
  2. 2026-10-03 Alias added: GHSA-hrvc-4vxq-q985

References

Exploit 1

See all 34 →

Sources

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