PT-2026-22509 · Wren · Wren

Oneafter · Published 2026-03-01 · Updated 2026-03-05 · CVE-2026-3387

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions wren-lang wren versions up to 0.4.0

Description A flaw exists in the getByteCountForArguments function within the src/vm/wren compiler.c file. This can lead to a null pointer dereference. Local access is needed for exploitation. The details of the issue have been publicly disclosed.

Recommendations Versions prior to 0.4.0 should be used. As a temporary workaround, consider restricting access to the getByteCountForArguments() function until a patch is available.

Exploit

Fix

Improper Resource Release

NULL Pointer Dereference

Weakness Enumeration

CWE-404

CWE-476

Related Identifiers

CVE-2026-3387

Affected Products

Wren

References · 14

• 🔥 https://github.com/oneafter/0122/blob/main/i1220/repro · Exploit
• https://github.com/wren-lang/wren/issues/1220 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3387 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3387 · Security Note
• https://twitter.com/infoflowcloud/status/2028068076202205356 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2028063801317159321 · Twitter Post
• https://vuldb.com/?ctiid.348273 · Note
• https://vuldb.com/?submit.761312 · Note
• https://vuldb.com/?id.348273 · Note
• https://t.me/CVEtracker/46061 · Telegram Post
• https://t.me/cveNotify/153666 · Telegram Post
• https://t.me/cveNotify/154250 · Telegram Post
• https://github.com/wren-lang/wren · Note
• https://twitter.com/CVEnew/status/2028067070055956481 · Twitter Post