What’s Vulnerable › Vulnerabilities

CVE-2026-2657: wren-lang wren Error Message wren_compiler.c printError stack-based overflow

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-18 · updated 2026-06-17
• Weakness: CWE-119

Description

A vulnerability has been found in wren-lang wren up to 0.4.0. This impacts the function printError of the file src/vm/wren_compiler.c of the component Error Message Handler. Such manipulation leads to stack-based buffer overflow. An attack has to be approached locally. 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.

Affected products

• wren-lang wren: through 0.4.0

References

• https://github.com/oneafter/0122/blob/main/i1221/repro
• https://github.com/wren-lang/wren/
• https://github.com/wren-lang/wren/issues/1221
• https://vuldb.com/?ctiid.346455
• https://vuldb.com/?id.346455
• https://vuldb.com/?submit.752791

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