CVE-2026-63033

MZ Automation lib60870 Out-of-bounds Read

6.9 Medium

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: Low

Exploit likelihood

0.46%Up 0.2 points since Jul 31, 2026

What each source reports

CVE List Score used 6.9

MZ Automation lib60870 Out-of-bounds Read

Record: CVE-2026-63033
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-125
Updated: 2026-11-02

EUVDEUVD-2026-51361 6.9

Record: EUVD-2026-51361
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-gqw6-mwcf-3xwh 6.9

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU...

Record: GHSA-gqw6-mwcf-3xwh
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-125
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-63033
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness: CWE-125
Updated: 2026-11-02

OSV 6.9

MZ Automation lib60870 Out-of-bounds Read

Record: CVE-2026-63033
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-125
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-63033 6.9

Record: UBUNTU-CVE-2026-63033
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated: 2026-11-02

Affected products

mz automation lib60870

Affected packages

Affected packages
Package	Affected	Fixed
`lib60870` Ubuntu:26.10	All versions, plus listed versions 2.3.6-1.12.4.0-1	None known
`lib60870` Ubuntu:26.04:LTS	All versions, plus listed versions 2.3.4-12.3.6-12.3.6-1.1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-63033 is a medium vulnerability (CVSS 6.9) in Mz Automation Lib60870, published July 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. No source names a fixed version.