CVE-2026-105689 Penpot: SSRF guard bypass via IPv6 transition addresses (NAT64/6to4/Teredo) in webhook delivery and media download
Attackers can bypass SSRF protections in Penpot using IPv6 transition addresses to access internal resources or cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105689?
CVE-2026-105689 is a medium-severity server-side request forgery vulnerability in penpot, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-105689?
How do I fix CVE-2026-105689?
No fix has been published for CVE-2026-105689 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-105689 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105689 exists.
Sources
Also known as GHSA-wxgm-8qjw-x445.