Out-of-bounds read in upx
Priority LOW 25CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.
Summary
An out-of-bounds read access vulnerability was discovered in UPX in PackLinuxElf64::canPack() function of p_lx_elf.cpp file. An attacker with a crafted input file could trigger this issue that could cause a crash leading to a denial of service.
Why it matters now
EPSS 0.00329 26th 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | upx | Fixed in v3.96. | — | No fix listed | CNA |
- upx Vendor— Affected Fixed in v3.96. Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-27788
- 2026-10-03 Alias added: GHSA-fmj5-4m95-44jw
References
More Upx vulnerabilities
- TI-2021-19310 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19309 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19308 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19307 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19306 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19305 Memory corruption in upx CVSS 3.1HIGH 7.5
Sources
- CVE-2020-27788 · CVE Program
- CVE-2020-27788 · NVD
- FIRST EPSS
- GHSA-fmj5-4m95-44jw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences