vulnerability / NVI-00014192 / Revision 1
Dozzle: SSRF guard bypass via IPv6 transition addresses (6to4/NAT64/Teredo) in webhook notification dispatcher
GitHub lists this reviewed advisory for github.com/amir20/dozzle. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/amir20/dozzle
source listed< 1.29.1-0.20260804193351-8cf7ccd5ee04
## Summary The `isBlockedIP` SSRF guard in Dozzle's webhook notification dispatcher blocks loopback, link-local, multicast, and unspecified addresses but does not recognize IPv6 transition mechanism addresses (RFC 3056 6to4, RFC 6052 NAT64, RFC 4380 Teredo) that embed arbitrary IPv4 addresses. An authenticated user can bypass the guard to reach loopback services, cloud metadata endpoints (169.254.169.254), and other blocked ranges via webhook notification URLs. ## Affected component / versions - Package: `github.com/amir20/dozzle` - Affected versions: all versions with SSRF guard (current HEAD `b9df313`) - Vulnerable code: `internal/notification/dispatcher/webhook.go` ## Details ### Root cause (CWE-918) `internal/notification/dispatcher/webhook.go:32-51`: ```go func isBlockedIP(ip net.IP) bool { if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsMulticast() || ip.IsInterfaceLocalMulticast() || ip.IsUnspecified() { re
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
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04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-p2w3-6x73-2f6x ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
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