CVE-2026-105689 penpot CVE debrief

Who should care

Penpot administrators and users, cloud environment administrators, and security teams should assess exposure and update to version 2.18.0 or later. Affected operator, platform, vulnerability-management, and security-team impact should be evaluated. Defenders should verify affected scope, severity, and vendor guidance.

Why it matters

The CVE-2026-105689 vulnerability in Penpot allows for SSRF guard bypass via IPv6 transition addresses, potentially exposing response bodies and status. Penpot administrators and users should assess exposure and update to version 2.18.0 or later.

• Potential exposure of response bodies via media import
• Potential exposure of response status as a network-probing side channel via webhook delivery
• Requires verification of Penpot instance configurations and updates to version 2.18.0 or later
• May require assessment of cloud environment configurations for potential SSRF bypass vulnerabilities

Technical summary

Penpot is vulnerable to SSRF guard bypass via IPv6 transition addresses (NAT64/6to4/Teredo) in webhook delivery and media download. The issue is fixed in version 2.18.0. Exploitation requires routing through a NAT64 gateway or an attacker-controlled DNS AAAA record. Cloud environments with NAT64 gateways are directly exploitable. A user controlling a media import URL, or an administrator controlling a webhook URL, can supply an IPv6 transition address that embeds a cloud-metadata, loopback, link-local, or private IPv4 target and bypasses the intended SSRF restrictions.

Defensive priority

Medium

Recommended defensive actions

• Review and update Penpot to version 2.18.0 or later
• Assess exposure of Penpot instances to IPv6 transition addresses
• Verify webhook and media import configurations for potential SSRF bypass vulnerabilities
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the SSRF guard bypass vulnerability in Penpot. The issue is fixed in version 2.18.0. Evidence limits suggest verifying Penpot instance configurations and updates to version 2.18.0 or later. Defenders should verify affected scope, severity, and vendor guidance. The vulnerability allows for potential exposure of response bodies via media import and response status as a network-probing side channel via webhook delivery.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.