Uncontrolled resource consumption in validators Python package

published 2019-12-05 6 y ago modified 2026-06-17 4 mo ago also GHSA-5qcg-w2cc-xffw , PYSEC-2019-134 , EUVD-2019-0154

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits: 0; none known

The validators package 0.12.2 through 0.12.5 for Python enters an infinite loop when validators.domain is called with a crafted domain string. This is fixed in 0.12.6.

Patch / fix

fixed in 1 distros 1

pypi validators 0.12.6

python-validators openSUSE Tumbleweed 0.35.0-1.4
python-validators openSUSE Tumbleweed 0.24.0-1.2

opensuse advisories openSUSE-SU-2026:12046-1 openSUSE-SU-2024:13811-1

Exploit prediction

1.47% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/kvesteri/validators/issues/86 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	validators	>=0.12.2, <0.12.6	0.12.6

Classification

Weakness

CWE-835 Loop with Unreachable Exit Condition

References

github.com /kvesteri/validators/issues/86
web, exploit, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2019-19588
advisory
github.com /python-validators/validators/issues/86
web
github.com /advisories/GHSA-5qcg-w2cc-xffw
advisory
github.com /pypa/advisory-database/tree/main/vulns/validators/PYSEC-2019-134.yaml
web
github.com /python-validators/validators
package

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.

Summary