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Fencer Vulns
low 3.7

CVE-2023-26112 json

configobj ReDoS exploitable by developer using values in a server-side configuration file

published 2023-04-03 3 y ago modified 2026-09-10 1 mo ago also GHSA-c33w-24p9-8m24 , PYSEC-2026-1270 , EUVD-2023-1260

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

All versions of the package configobj are vulnerable to Regular Expression Denial of Service (ReDoS) via the validate function, using (.+?)\((.*)\). **Note:** This is only exploitable in the case of a developer, putting the offending value in a server side configuration file.

Patch / fix

  • pypi configobj 5.0.9
  • configobj Debian 14, Debian 13 5.0.8-2

debian advisories DEBIAN-CVE-2023-26112

  • configobj Ubuntu 20.04 LTS 5.0.6-4ubuntu0.1
  • configobj Ubuntu 22.04 LTS 5.0.6-5ubuntu0.1
  • configobj Ubuntu Pro 14.04 LTS 4.7.2+ds-5ubuntu0.1~esm1
  • configobj Ubuntu Pro 16.04 LTS 5.0.6-2ubuntu0.16.04.1~esm1
  • configobj Ubuntu Pro 18.04 LTS 5.0.6-2ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2023-26112

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-configobj SLE Real Time 15 SP3, SLE Module for Basesystem 15 SP5, SLE Module for Basesystem 15 SP4 +6 more 5.0.6-150000.3.3.1
  • python-configobj SLES for SAP 12 SP5, SLES 12 SP5, SLE Module for Public Cloud 12 5.0.6-20.8.1

suse advisories SUSE-SU-2023:3369-1SUSE-SU-2023:3368-1

  • python-configobj openSUSE Tumbleweed 5.0.9-1.6

opensuse advisories openSUSE-SU-2026:12005-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-26112 updated cvss 5.9

python-configobj: Regular expression denial of service exists in ./src/configobj/validate.py

  • Red Hat Enterprise Linux 6 python-configobj Red Hat Enterprise Linux 7 python-configobj
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 python3-configobj Red Hat Enterprise Linux 9 python3-configobj Red Hat OpenShift Dev Spaces devspaces-udi-container
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • security.snyk.io https://security.snyk.io/vuln/SNYK-PYTHON-CONFIGOBJ-3252494 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
pypi configobj
<5.0.9
5.0.9

Affected products

  • n/a configobj

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.