CVE-2025-48172

Publication date 4 July 2025

Last updated 10 July 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
chmlib	25.10 questing	Needs evaluation
	25.04 plucky	Needs evaluation
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

How can I get the fixes?
What do statuses mean?

Severity score breakdown

Parameter	Value
Base score	5.6 · Medium
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

References

MITRE
NVD
Launchpad
Debian

Other references

https://www.cve.org/CVERecord?id=CVE-2025-48172
https://drive.google.com/file/d/1wq51px42eoJz2VQ1Qu9ObPVQVom9T9H_/view?usp=sharing
https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=sharing
https://github.com/jedwing/CHMLib/blob/2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f/src/chm_lib.c#L1386
https://github.com/sumatrapdfreader/sumatrapdf/commit/08179946a745cf1605e4b9670942ec1a6e1f4c5d