CVE-2025-48172 Integer overflow in CHMLib
An integer overflow in CHMLib leads to a heap-based buffer overflow, potentially allowing attackers to execute arbitrary code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-48172?
CVE-2025-48172 is a medium-severity vulnerability in CHMLib, published on 4 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
CHMLib through 2bef8d0, as used in SumatraPDF and other products, has a chm_lib.c _chm_decompress_block integer overflow. There is a resultant heap-based buffer overflow in _chm_fetch_bytes.
Weakness: CWE-190
Which versions are affected by CVE-2025-48172?
Linux distribution packages (1)
chmlib openSUSE:Tumbleweed | All versions | 0.40-26.1 |
How do I fix CVE-2025-48172?
Apply the vendor's patch.
Is CVE-2025-48172 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-48172 exists.
Sources
Also known as GHSA-rpc6-w47v-qqr6, UBUNTU-CVE-2025-48172, openSUSE-SU-2025:15326-1.