CVE-2025-12829 Information disclosure in Ion-C
An attacker can craft data to expose sensitive memory contents via UTF-8 escape sequences in Amazon Ion-C serialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12829?
CVE-2025-12829 is a medium-severity vulnerability in Amazon Ion-C, published on 7 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An uninitialized stack read issue exists in Amazon Ion-C versions <v1.1.4 that may allow a threat actor to craft data and serialize it to Ion text in such a way that sensitive data in memory could be exposed through UTF-8 escape sequences. To mitigate this issue, users should upgrade to version v1.1.4.
Weakness: CWE-125
Which versions are affected by CVE-2025-12829?
How do I fix CVE-2025-12829?
No fix has been published for CVE-2025-12829 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-12829 being exploited?
There is no known exploitation of CVE-2025-12829 in the wild and no public exploit code.
Sources
Also known as GHSA-7mgf-6x73-5h7r.