CVE-2026-25673 is a denial-of-service vulnerability affecting Django versions 6.0.3, 5.2.12, and 4.2.29 and earlier. It stems from the URLField.to_python() function’s disproportionately slow NFKC normalization on Windows for specific Unicode characters in large URL inputs, allowing a remote attacker to degrade service availability. This vulnerability is rated High severity (CVSS 7.5) due to its network attack vector, low attack complexity, and high impact on availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in the KEV catalog, though it has garnered moderate community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.2.0, < 4.2.29CPE matchmatch criteria | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* | ||
>= 5.2, < 5.2.12CPE matchmatch criteria | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* | ||
>= 6.0, < 6.0.3CPE matchmatch criteria | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* | ||
>= 4.2, < 4.2.29CPE match | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.