EUVD-2026-45100
GHSA-97fg-c6xr-m6cw
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network race condition requires low privilege and timing; scope change to downstream system maps CVSS 4.0 SC:H/SI:L to C:H/I:L with S:C.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
OpenClaw before 2026.5.28 contains a race condition in the MS Teams safeFetch DNS rebinding check. When the affected feature is enabled and reachable, a lower-trust caller or configured input path could win a timing window between the DNS validation check and use, allowing actions that should have required a stronger authorization or policy check. Practical impact depends on the operator's configuration and whether lower-trust input can reach that path.
AnalysisAI
DNS rebinding protection bypass in OpenClaw before 2026.5.28 allows a lower-privileged caller to win a TOCTOU race window in the MS Teams safeFetch DNS validation path, potentially enabling requests to internal or restricted resources that should have been blocked by policy. Exploitation requires the safeFetch DNS rebinding check feature to be both enabled and reachable, and practical impact is heavily configuration-dependent. No public exploit code has been identified and no CISA KEV listing exists; the issue is confirmed via a vendor GitHub security advisory and VulnCheck reporting.
Technical ContextAI
OpenClaw includes a safeFetch mechanism for its MS Teams integration, which enforces DNS rebinding protection - a policy layer intended to prevent server-side request forgery by validating that DNS-resolved addresses do not resolve to internal or unauthorized targets. CWE-367 (Time-of-Check Time-of-Use Race Condition) identifies the root cause: the application validates DNS resolution at check time, but a concurrent or asynchronous process can alter that resolution before the address is actually used, creating a window in which the policy check no longer reflects the real network destination. The affected product per CPE is cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:*:*:* covering all versions prior to 2026.5.28. The CVSS 4.0 scope change metrics (SC:H/SI:L) indicate the primary impact lands on a downstream system rather than on OpenClaw itself, consistent with a DNS rebinding scenario where the vulnerable host is exploited as an internal pivot rather than as a direct target.
RemediationAI
Upgrade OpenClaw to version 2026.5.28 or later, which resolves the TOCTOU race condition in the MS Teams safeFetch DNS rebinding check per the vendor advisory at https://github.com/openclaw/openclaw/security/advisories/GHSA-wxm8-ghhq-q688. If an immediate upgrade is operationally blocked, assess whether the MS Teams safeFetch DNS rebinding check feature can be disabled - doing so eliminates the attack surface entirely with no residual risk from this CVE, though it removes the associated DNS rebinding protection (operators should evaluate the tradeoff). As a secondary compensating control, restrict which callers can reach the safeFetch endpoint at the network layer (firewall rules, reverse proxy ACLs) to ensure only fully trusted callers have access, thereby eliminating the 'lower-trust caller' precondition described in the vulnerability; note this does not fix the underlying race condition and provides no protection if a trusted caller is compromised.
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