CVE-2026-3386: wren-lang wren wren_compiler.c emitOp out-of-bounds

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-01 · updated 2026-06-17
Weakness: CWE-119

Description

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 src/vm/wren_compiler.c. This manipulation causes out-of-bounds read. It is possible to launch the attack on the local host. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

wren-lang wren: through 0.4.0

References

https://github.com/oneafter/0122/blob/main/i1219/repro
https://github.com/wren-lang/wren/
https://github.com/wren-lang/wren/issues/1219
https://vuldb.com/?ctiid.348272
https://vuldb.com/?id.348272
https://vuldb.com/?submit.761306

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