CVE-2026-3994: rui314 mold Object File input-files.cc initialize_sections heap-based overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-12 · updated 2026-06-17
Weakness: CWE-119

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.

Affected products

rui314 mold: 2.40.0, 2.40.1, 2.40.2, 2.40.3, 2.40.4

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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