CVE-2026-3994
CVE-2026-3994 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. 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-119.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 4.3
- CVSS v4: 1.9
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-11537
- Weakness: CWE-119
- Published:
- Last modified:
Description
A vulnerability was detected in rui314 mold up to 2.40.4. This issue affects the function mold::ObjectFilemold::X86_64::initialize_sections of the file src/input-files.cc of the component Object File Handler. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit is now 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-2026-3994?
- A vulnerability was detected in rui314 mold up to 2.40.4. This issue affects the function mold::ObjectFilemold::X86_64::initialize_sections of the file src/input-files.cc of the component Object File Handler. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit is now 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-2026-3994?
- CVE-2026-3994 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2026-3994 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.
- How do I fix CVE-2026-3994?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-3994 have an EU (EUVD) identifier?
- Yes. CVE-2026-3994 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11537.
- When was CVE-2026-3994 published?
- CVE-2026-3994 was published on 2026-03-12 and last updated on 2026-06-17.
References
- https://github.com/oneafter/0209/blob/main/mo2/repro
- https://github.com/rui314/mold/
- https://github.com/rui314/mold/issues/1548
- https://vuldb.com/?ctiid.350476
- https://vuldb.com/?id.350476
- https://vuldb.com/?submit.769772
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