Use After Free Affecting metacall package, versions *

Q: How to fix?

There is no fixed version for metacall .

Threat Intelligence

Proof of Concept

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Snyk IDSNYK-RUST-METACALL-17367817
published17 Jun 2026
disclosed1 Jun 2026
creditUnknown

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Introduced: 1 Jun 2026

CWE-416 (opens in a new tab)

How to fix?

There is no fixed version for metacall.

Overview

Affected versions of this package are vulnerable to Use After Free in the MetaCallException::new() function. The exception_struct value is not freed correctly, leading to bad-free exception.

References

CVSS Base Scores

version 4.0

version 3.1

Attack Vector (AV)
Network
Attack Complexity (AC)
Low
Attack Requirements (AT)
None
Privileges Required (PR)
None
User Interaction (UI)
None

Confidentiality (VC)
None
Integrity (VI)
None
Availability (VA)
Low

Confidentiality (SC)
None
Integrity (SI)
None
Availability (SA)
None