What is the CVSS score of CVE-2026-30837?

CVE-2026-30837 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-30837?

Yes, a public proof-of-concept exploit is available for CVE-2026-30837. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-30837?

Within 24 hours: Identify and inventory all systems running affected OpenAPI versions up to 1.4.26 and assess exposure to untrusted input. Within 7 days: Implement compensating controls including WAF rules to detect malicious regex patterns, enable request rate limiting, and apply network segmentation to limit exposure. Within 30 days: Upgrade to patched version once available from vendor, or migrate to alternative solutions if patch timeline is unacceptable.

Elysia CVE-2026-30837

Q: Which versions of Elysia are affected by CVE-2026-30837?

A high-severity denial-of-service vulnerability exists in OpenAPI documentation and client-server communication affecting versions up to 1.4.26.. A patch is available.

HIGH

Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)

2026-03-10 security-advisories@github.com

GHSA-f45g-68q3-5w8x

Denial Of Service Elysia

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

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

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:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

PoC Detected

Mar 20, 2026 - 15:23 vuln.today

Public exploit code

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Mar 10, 2026 - 21:16 nvd

HIGH 7.5

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

3 npm packages depend on elysia (3 direct, 0 indirect)

Ecosystem-wide dependent count for version 1.4.26.

DescriptionGitHub Advisory

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Prior to 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.

AnalysisAI

OpenAPI documentation and client-server communication. versions up to 1.4.26 is affected by inefficient regular expression complexity (redos) (CVSS 7.5).

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Craft malicious URL string with repeated protocol/hostname pattern

Exploit

Submit to Elysia endpoint using t.String({ format: 'url' }) validation

Execution

Trigger catastrophic regex backtracking

Impact

Cause denial of service

Access

Craft malicious URL string with repeated protocol/hostname pattern

Exploit

Submit to Elysia endpoint using t.String({ format: 'url' }) validation

Execution

Trigger catastrophic regex backtracking

Impact

Cause denial of service

Vulnerability AssessmentAI

Exploitation	Elysia framework versions prior to 1.4.26 with t.String({ format: 'url' }) validator enabled for request validation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	Fixed in version 1.4.26.. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify and inventory all systems running affected OpenAPI versions up to 1.4.26 and assess exposure to untrusted input. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-30837 vulnerability details – vuln.today

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Elysia CVE-2026-30837

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

Blast Radius

DescriptionGitHub Advisory

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code