What’s Vulnerable › Vulnerabilities

CVE-2026-2858: wren-lang wren Source File wren_compiler.c peekChar out-of-bounds

• Severity: high (CVSS 7.1 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: 2026-02-20 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• wren-lang wren: through 0.4.0

References

• https://github.com/oneafter/0122/blob/main/i1217/repro
• https://github.com/wren-lang/wren/
• https://github.com/wren-lang/wren/issues/1217
• https://vuldb.com/?ctiid.347097
• https://vuldb.com/?id.347097
• https://vuldb.com/?submit.754489

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