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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.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-20 | Updated 2026-02-24 | Assigner VulDB




MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

Problem types

Out-of-Bounds Read

Memory Corruption

Product status

0.1
affected

0.2
affected

0.3
affected

0.4.0
affected

Timeline

2026-02-20:Advisory disclosed
2026-02-20:VulDB entry created
2026-02-20:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.347097 (VDB-347097 | wren-lang wren Source File wren_compiler.c peekChar out-of-bounds) vdb-entry technical-description

vuldb.com/?ctiid.347097 (VDB-347097 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.754489 (Submit #754489 | wren-lang wren main-branch Heap-based Buffer Overflow) third-party-advisory

github.com/wren-lang/wren/issues/1217 issue-tracking

github.com/oneafter/0122/blob/main/i1217/repro exploit

github.com/wren-lang/wren/ product

cve.org (CVE-2026-2858)

nvd.nist.gov (CVE-2026-2858)

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