How severe is CVE-2026-3387?

CVE-2026-3387 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-3387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3387?

CVE-2026-3387 affects Wren. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3387?

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

Does CVE-2026-3387 have an EU (EUVD) identifier?

Yes. CVE-2026-3387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9122.

When was CVE-2026-3387 published?

CVE-2026-3387 was published on 2026-03-01 and last updated on 2026-06-17.

CVE-2026-3387

CVE-2026-3387 is a low-severity vulnerability in Wren with a CVSS 3.x base score of 3.3. 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-404.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 1.7
CVSS v4: 1.9
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9122
Weakness: CWE-404
Affected product: Wren
Published: 2026-03-01
Last modified: 2026-06-17

Description

A vulnerability has been found in wren-lang wren up to 0.4.0. Affected by this issue is the function getByteCountForArguments of the file src/vm/wren_compiler.c. Such manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Frequently asked questions

What is CVE-2026-3387?: A vulnerability has been found in wren-lang wren up to 0.4.0. Affected by this issue is the function getByteCountForArguments of the file src/vm/wren_compiler.c. Such manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
How severe is CVE-2026-3387?: CVE-2026-3387 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-3387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3387?: CVE-2026-3387 affects Wren. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3387?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3387 have an EU (EUVD) identifier?: Yes. CVE-2026-3387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9122.
When was CVE-2026-3387 published?: CVE-2026-3387 was published on 2026-03-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wren:wren:*:*:*:*:*:*:*:*

More vulnerabilities in Wren

CVE-2026-3386 — Low (CVSS 3.3): A flaw has been found in wren-lang wren up to 0.4.0. Affected by this vulnerability is the function emitOp of the file…
CVE-2026-3385 — Low (CVSS 3.3): A vulnerability was detected in wren-lang wren up to 0.4.0. Affected is the function resolveLocal of the file…
CVE-2026-2858 — Low (CVSS 3.3): A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file…
CVE-2026-2657 — Low (CVSS 3.3): A vulnerability has been found in wren-lang wren up to 0.4.0. This impacts the function printError of the file…

All CVEs affecting Wren →

Other CWE-404 vulnerabilities

CVE-2023-24444 — Critical (CVSS 9.8): Jenkins OpenID Plugin 2.4 and earlier does not invalidate the previous session on login.
CVE-2024-31611 — Critical (CVSS 9.1): SeaCMS 12.9 has a file deletion vulnerability via admin_template.php.
CVE-2018-8450 — High (CVSS 8.8): A remote code execution vulnerability exists when Windows Search handles objects in memory, aka "Windows Search Remote…
CVE-2026-11317 — High (CVSS 8.7): A denial of service security issue exists in the affected product. The security issue stems from a fault occurring when…
CVE-2022-25762 — High (CVSS 8.6): If a web application sends a WebSocket message concurrently with the WebSocket connection closing when running on…
CVE-2020-26070 — High (CVSS 8.6): A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series…

Browse all CWE-404 vulnerabilities →