What is CVE-2026-25479?

CVE-2026-25479 is a medium-severity vulnerability in Litestar, classified under Incorrect Regular Expression. CVSS score: 6.5/10. Published 2026-02-09.

How severe is CVE-2026-25479?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Litestar

CVE-2026-25479

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special me…

EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Litestar
Litestar-org Litestar — versions < 2.20.0

Weakness classification (CWE)

CWE-185 — Incorrect Regular Expression

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-25479?: CVE-2026-25479 is a medium-severity vulnerability in Litestar, classified under Incorrect Regular Expression. CVSS score: 6.5/10. Published 2026-02-09.
How severe is CVE-2026-25479?: Medium severity. CVSS v3 base score is 6.5 out of 10.