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CVE-2026-105689

Penpot: SSRF guard bypass via IPv6 transition addresses (NAT64/6to4/Teredo) in webhook delivery and media download

MEDIUM
6
CVSS Score
Published: October 5, 2026 at 07:51 PM UTC
Updated: October 8, 2026 at 03:16 AM UTC
1 product affected across 1 vendorPenpot

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Severity
MEDIUM6
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

Penpot is an open-source design and prototyping platform. Prior to 2.18.0, app.util.ssrf/blocked-address? relies on Java InetAddress predicates that do not classify NAT64, 6to4, or Teredo addresses and applies additional CIDR checks only to IPv4 values. 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 then supply an IPv6 transition address that embeds a cloud-metadata, loopback, link-local, or private IPv4 target and bypasses the intended SSRF restrictions. Media import can disclose response bodies, while webhook delivery can expose response status as a network-probing side channel. This issue is fixed in version 2.18.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Penpot· Penpot
60%
v < 2.18.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/penpot/penpot/security/advisories/GHSA-wxgm-8qjw-x445
x_refsource_MISC
Source: cverecord
https://github.com/penpot/penpot/commit/326d83e780ae120b45ccd6f3d7bd24922b54461c
x_refsource_MISC
Source: cverecord
https://github.com/penpot/penpot/releases/tag/2.18.0

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-918

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