What is the CVSS score of CVE-2026-25479?

CVE-2026-25479 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Litestar are affected by CVE-2026-25479?

Organizations using Litestar should be aware of notable risk from CVE-2026-25479 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2026-25479?

Yes, a public proof-of-concept exploit is available for CVE-2026-25479. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-25479?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Litestar CVE-2026-25479

MEDIUM

Incorrect Regular Expression (CWE-185)

2026-02-09 security-advisories@github.com

GHSA-93ph-p7v4-hwh4

Authentication Bypass Litestar

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 17, 2026 - 15:14 vuln.today

Public exploit code

Patch released

Feb 17, 2026 - 15:14 nvd

Patch available

CVE Published

Feb 09, 2026 - 20:15 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

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 meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.

AnalysisAI

Litestar versions before 2.20.0 improperly escape regex metacharacters in the allowed_hosts middleware, allowing attackers to bypass hostname validation by supplying hosts that match the compiled regex pattern but differ from intended literal hostnames. Public exploit code exists for this vulnerability. The flaw affects the ASGI framework's ability to properly restrict incoming requests to authorized hosts.

Technical ContextAI

Affects Litestar. 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 meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.