CVE-2026-112300 DiffSK configobj __init__.py _sectionmarker redos
Attackers can cause denial of service in DiffSK configobj via inefficient regular expression complexity in the section marker parser.
- 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-2026-112300?
CVE-2026-112300 is a medium-severity denial of service vulnerability in DiffSK configobj, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in DiffSK configobj up to 5.0.9. Affected by this vulnerability is the function _sectionmarker of the file configobj/__init__.py. The manipulation leads to inefficient regular expression complexity. Remote exploitation of the attack is possible. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-112300?
How do I fix CVE-2026-112300?
No fix has been published for CVE-2026-112300 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-112300 being exploited?
There is no known exploitation of CVE-2026-112300 in the wild and no public exploit code.
Sources
Also known as AZL-110064, BELL-CVE-2026-112300, DEBIAN-CVE-2026-112300, GHSA-w53r-mv8r-wgxx, UBUNTU-CVE-2026-112300.