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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-25478

22
FAUCET Score

CVE-2026-25478 affects the Litestar ASGI framework prior to version 2.20.0, stemming from improper handling of regular expression metacharacters in CORS origin validation. An attacker can bypass Cross-Origin Resource Sharing (CORS) policies by crafting a malicious origin that unexpectedly matches the unescaped regex, potentially leading to unauthorized data access. This medium-severity vulnerability (CVSS 6.5) requires user interaction (UI:R) but can result in high confidentiality impact (C:H) if exploited. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.20.0CPE matchmatch criteria
cpe:2.3:a:litestar:litestar:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.4HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.38%
Probability of exploitation in next 30 days
EPSS Percentile
30.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0038 is in the 32nd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: litestarFixed in: 2.20.0

Vendor Advisories (1)

pipGHSA-2p2x-hpg8-cqp2high

Litestar's CORS origin allowlist has a bypass due to unescaped regex metacharacters in allowed origins

Feb 9, 2026

References

docs.litestar.dev / 2/release-notes/changelog.html
Release Notes
github.com / litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a
Patch
github.com / litestar-org/litestar/releases/tag/v2.20.0
Release Notes
github.com / litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2
ExploitVendor Advisory