CVE
ideon: SSRF protection bypass via IPv6 transition addresses (NAT64 / 6to4 / IPv4-mapped) in link preview
Affects ideon 0.9.5 and earlier, including current HEAD, through the link preview feature, which fetches user-provided URLs server-side. Fixed in 0.9.6.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 0.9.6
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affects ideon versions up to and including 0.9.5 (all versions including current HEAD). The link preview feature (fetchLinkMetadata) fetches user-provided URLs server-side.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 15/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The ideon self-hosted visual workspace (vendor 3xpyth0n) has a flaw in its link preview feature, where its server-side request protection can be bypassed using IPv6 transition address formats. An attacker who can log in as a regular user can remotely submit crafted link URLs to make the server fetch cloud metadata endpoints, localhost services, and internal network addresses.
Read the original description
ideon is a self-hosted visual workspace. Prior to version 0.9.6, the SSRF protection in safeFetch is bypassed by IPv6 transition addresses that embed private IPv4 addresses. The isPrivateIP function in src/app/lib/ssrf.ts checks only a narrow set of IPv6 ranges (loopback ::1, ULA fc/fd, link-local fe80) but does not recognize IPv4-mapped (::ffff:), NAT64 well-known (64:ff9b::/96, RFC 6052), NAT64 local-use (64:ff9b:1::/48, RFC 8215), 6to4 (2002::/16, RFC 3056), or Teredo (2001::/32, RFC 4380) encodings. An authenticated user can supply these addresses in link URLs to reach cloud metadata endpoints (169.254.169.254), localhost services, and RFC 1918 internal networks through the link preview metadata fetcher. This issue has been patched in version 0.9.6.
Who should check
Anyone running self-hosted ideon 0.9.5 or earlier, where the link preview metadata fetcher is reachable by users.
Read the source excerpt
“Affected versions: all versions including current HEAD ( 5e420c3 )”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 65 if added to CISA KEV
- Would score about 60 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Affects ideon versions up to and including 0.9.5 (all versions including current HEAD). The link preview feature (fetchLinkMetadata) fetches user-provided URLs server-side.Upgrade to a fixed version: 0.9.6.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-103980 (ideon: SSRF protection bypass via IPv6 transition addresses (NAT64 / 6to4 / IPv4-mapped) in link preview), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-103980 (entry last updated 2026-11-11):
Affected:
- 3xpyth0n ideon: fixed in 0.9.6
Fixed versions: 0.9.6.
Conditions (all must be true for the bug to be hit):
- Affects ideon versions up to and including 0.9.5 (all versions including current HEAD). (source: https://github.com/3xpyth0n/ideon/security/advisories/GHSA-fwh7-rv72-xh5q)
- The link preview feature (fetchLinkMetadata) fetches user-provided URLs server-side. (source: https://github.com/3xpyth0n/ideon/security/advisories/GHSA-fwh7-rv72-xh5q)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
CISA KEV: CVE-2026-103980 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-103980 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-fwh7-rv72-xh5q
- https://github.com/3xpyth0n/ideon/commit/c4ffb1e50132b9264bde4a679fe24f084f20069d
- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.6
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-103980
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-103980"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- 3xpyth0n ideon
fixed in 0.9.6
Evidence 5
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Advisory
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 2
- Repository
- Repository
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-103980
Is CVE-2026-103980 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The SSRF protection in ideon's link preview fetcher can be bypassed with IPv6 transition addresses (NAT64, 6to4, IPv4-mapped). The fetcher then reaches cloud instance metadata, including IAM temporary credentials, and localhost or RFC 1918 internal network services.Source: github.com
Which versions are affected by CVE-2026-103980?
ideon: before 0.9.6.Source: cve.now feed data
Am I affected, and how do I check?
Versions up to and including 0.9.5 are affected, as is the current HEAD (5e420c3). The affected feature is link preview (fetchLinkMetadata in metadata.ts). To check a installation, compare its ideon version against 0.9.6 and see whether link preview is in use.Source: github.com
How do I fix CVE-2026-103980?
Upgrade ideon to 0.9.6 or later, which is the fixed release.Source: github.com