Microsoft UFO: IPv6 transition address bypass of SSRF guard in URL validation (CVE-2026-73297) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-73297

Microsoft UFO: IPv6 transition address bypass of SSRF guard in URL validation

Answer in brief

CVE-2026-73297 records a Medium severity (CVSS 6.9) vulnerability in Microsoft UFO: IPv6 transition address bypass of SSRF guard in URL validation. The current sources do not mark it as known exploited. The current feed maps microsoft/UFO (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 12, 2026Updated Sep 18, 2026Source checked Sep 27, 2026First seen by HOL Aug 12, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps microsoft/UFO (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
microsoft/UFOgeneric	<3.0.8	3.0.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for microsoft/UFO.
Review the reported fix. Update microsoft/UFO to 3.0.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source description

Microsoft UFO open-source framework for intelligent automation across devices and platforms. Prior to 3.0.8, _is_blocked_ip in ufo/utils/url_security.py did not block NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48, the 6to4 prefix 2002::/16, or the Teredo prefix 2001::/32 and did not re-check embedded IPv4 destinations, allowing an unauthenticated remote attacker who can influence URLs processed by validate_url to bypass the SSRF guard and reach cloud metadata, internal services, or localhost. This issue is fixed in version 3.0.8.

Quoted source text, attributed separately from HOL analysis.