How severe is CVE-2026-25478?

CVE-2026-25478 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-25478 being actively exploited?

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

What products are affected by CVE-2026-25478?

CVE-2026-25478 affects Litestar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25478?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25478 have an EU (EUVD) identifier?

Yes. CVE-2026-25478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6496.

When was CVE-2026-25478 published?

CVE-2026-25478 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25478

CVE-2026-25478 is a high-severity vulnerability in Litestar with a CVSS 3.x base score of 7.4. 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-942.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6496
Weakness: CWE-942
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, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.

Frequently asked questions

What is CVE-2026-25478?: Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.
How severe is CVE-2026-25478?: CVE-2026-25478 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-25478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25478?: CVE-2026-25478 affects Litestar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25478?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25478 have an EU (EUVD) identifier?: Yes. CVE-2026-25478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6496.
When was CVE-2026-25478 published?: CVE-2026-25478 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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