GHSA-hmv2-79q8-fv6g · Severity: high · Ecosystem: pip — Uncontrolled Resource Consumption in urllib3
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Conclusion & alert: CVE-2020-7212 is rated Moderate Risk (62.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.29%). Core evidence: EPSS rose +2.50% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.79% | 3.29% | +2.50% |
| 2 | 2026-06-11 | 1.15% | 0.79% | -0.36% |
| 3 | 2026-05-27 | — | 1.15% | — |
Full EPSS history (19 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 7.8 | 2.0 | HIGH |
|
10.0 | 6.9 | [email protected] |
GHSA-hmv2-79q8-fv6g · Severity: high · Ecosystem: pip — Uncontrolled Resource Consumption in urllib3
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2020-7212 not yet assigned priority: Debian including 1 source packages (python-urllib3), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2020-7212 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2020-7212 |
ubuntu
|
medium | CVE-2020-7212 medium priority: Ubuntu including 1 source packages (python-urllib3), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): not-affected 5, released 1. | https://ubuntu.com/security/CVE-2020-7212 |
| URL | Tags |
|---|---|
| https://github.com/urllib3/urllib3/blob/master/CHANGES.rst | Release Notes Third Party Advisory |
| https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a | Patch Third Party Advisory |
| https://pypi.org/project/urllib3/1.25.8/ | Release Notes Vendor Advisory |