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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| DiffSK | configobj | 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | configobj | No fix yet | — |
| Debian 13 | configobj | No fix yet | — |
| Debian 12 | configobj | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | configobj | No fix yet | — |
| Ubuntu 26.04 LTS | configobj | No fix yet | — |
| Ubuntu 24.04 LTS | configobj | No fix yet | — |
| Ubuntu 22.04 LTS | configobj | No fix yet | — |
| Ubuntu 20.04 LTS | configobj | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | configobj | No fix yet | — |
| Ubuntu Pro 16.04 LTS | configobj | No fix yet | — |
| Ubuntu Pro 14.04 LTS | configobj | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-configobj | 5.0.9-2.1 | openSUSE-SU-2026:12473-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-configobj | No fix yet | — |
Advisories 1
- openSUSE-SU-2026:12473-1 python313-configobj-5.0.9-2.1 on GA media SUSE / openSUSE Security Updates · Nov 7, 2026
References
- VDB-422346 | DiffSK configobj __init__.py _sectionmarker redos vdb-entry technical-description
- VDB-422346 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- CVE-2026-112300 | CVE Analysis and Report third-party-advisory
- Submit #989395 | DiffSK configobj 5.0.9 Denial of Service third-party-advisory
- https://github.com/DiffSK/configobj/issues/281 issue-tracking
- https://github.com/DiffSK/configobj/ product