How severe is CVE-2026-25479?

CVE-2026-25479 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-25479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25479?

CVE-2026-25479 affects Litestar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25479?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25479 have an EU (EUVD) identifier?

Yes. CVE-2026-25479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6497.

When was CVE-2026-25479 published?

CVE-2026-25479 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25479

CVE-2026-25479 is a medium-severity vulnerability in Litestar with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-185.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6497
Weakness: CWE-185
Affected product: Litestar
Published: 2026-02-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2026-25479?: CVE-2026-25479 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-25479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25479?: CVE-2026-25479 affects Litestar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25479?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25479 have an EU (EUVD) identifier?: Yes. CVE-2026-25479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6497.
When was CVE-2026-25479 published?: CVE-2026-25479 was published on 2026-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:litestar:litestar:*:*:*:*:*:*:*:*

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