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TI-2026-02923 Aliases CVE-2026-3387GHSA-w7j5-25g6-jc8f

wren-lang wren wren_compiler.c getByteCountForArguments null pointer dereference

Priority MEDIUM 55CWE-404Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-404.

Summary

A vulnerability has been found in wren-lang wren up to 0.4.0. Affected by this issue is the function getByteCountForArguments of the file src/vm/wren_compiler.c. Such manipulation leads to null pointer dereference. Local access is required to approach this attack. 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00189 8th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
wren-langwren0.1; 0.2; 0.3; 0.4.0—No fix listedCNA
  • wren Vendorwren-lang Affected 0.1; 0.2; 0.3; 0.4.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:wren:wren:*:*:*:*:*:*:*:*up to 0.4.0Vulnerablewren-lang
  • cpe:2.3:a:wren:wren:*:*:*:*:*:*:*:* Versions up to 0.4.0 Vulnerable ·wren-lang

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3387
  2. 2026-10-03 Alias added: GHSA-w7j5-25g6-jc8f

References

Exploit 2

Other 1

  • TI-2026-02922 wren-lang wren wren_compiler.c emitOp out-of-bounds CVSS 4.0MEDIUM 4.8
  • TI-2026-02921 wren-lang wren wren_compiler.c resolveLocal recursion CVSS 4.0MEDIUM 4.8
  • TI-2026-02454 wren-lang wren Source File wren_compiler.c peekChar out-of-bounds CVSS 4.0MEDIUM 4.8
  • TI-2026-02269 wren-lang wren Error Message wren_compiler.c printError stack-based overflow CVSS 4.0MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences