CVE-2026-63033 MZ Automation lib60870 Out-of-bounds Read
A crafted IEC 60870-5-104 message triggers an out-of-bounds read in lib60870, potentially causing crashes or leaking memory contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63033?
CVE-2026-63033 is a medium-severity memory corruption vulnerability in MZ Automation lib60870, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-63033?
How do I fix CVE-2026-63033?
No fix has been published for CVE-2026-63033 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63033 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63033 exists.
Sources
Also known as GHSA-7v97-jmwv-w5j7, GHSA-gqw6-mwcf-3xwh, UBUNTU-CVE-2026-63033.