CVE-2026-25805: Zed does not show Parameter Values for MCP Tool Calls. Users cannot detect tool poisoning.

Severity: high (CVSS 8.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-10 · updated 2026-06-17
Weakness: CWE-356

Description

Zed is a multiplayer code editor. Prior to 0.219.4, Zed does not show with which parameters a tool is being invoked, when asking for allowance. Further it does not show after the tool was being invoked, which parameters were used. Thus, maybe unwanted or even malicious values could be used without the user having a chance to notice it. Patched in Zed Editor 0.219.4 which includes expandable tool call details.

Affected products

zed-industries zed: before 0.219.4 — fixed in 0.219.4

How to fix

Upgrade to a fixed version: zed-industries zed 0.219.4. Check the vendor advisory for mitigations.

References

https://github.com/zed-industries/zed/security/advisories/GHSA-f2g4-87h6-4pxq

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