How severe is CVE-2026-2858?

CVE-2026-2858 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-2026-2858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2858?

CVE-2026-2858 affects Wren. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2858?

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

Does CVE-2026-2858 have an EU (EUVD) identifier?

Yes. CVE-2026-2858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7782.

When was CVE-2026-2858 published?

CVE-2026-2858 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-2858

CVE-2026-2858 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-125.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 1.7
CVSS v4: 1.9
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7782
Weakness: CWE-125
Affected product: Wren
Published: 2026-02-20
Last modified: 2026-06-17

Description

A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might 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-2026-2858?: A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
How severe is CVE-2026-2858?: CVE-2026-2858 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-2026-2858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2858?: CVE-2026-2858 affects Wren. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2858 have an EU (EUVD) identifier?: Yes. CVE-2026-2858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7782.
When was CVE-2026-2858 published?: CVE-2026-2858 was published on 2026-02-20 and last updated on 2026-06-17.

References

Affected products (1)

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

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