CVE-2026-91131VulnerabilityPublished 6 Nov 2026

ZDI-26-897: Home Assistant Green aiohttp_client Server-Side Request Forgery Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 6 Nov 2026, 22:39 UTC

Severity

Medium

Rated Medium by Zero Day Initiative · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Description

A server-side request forgery (SSRF) vulnerability exists in Home Assistant Green's aiohttp_client component. This flaw allows network-adjacent attackers to make arbitrary requests from the affected server without requiring authentication. The vulnerability has been assigned CVE-2026-91131 and a CVSS rating of 5.4, indicating a medium severity level.

Impact

An attacker can leverage this SSRF vulnerability to cause the Home Assistant Green server to make arbitrary requests, potentially leading to unauthorized access to internal resources or information disclosure. Since no authentication is required, the attack surface is broader, but the impact is rated medium severity by the ZDI.

Summary

The vulnerability in Home Assistant Green's aiohttp_client enables an attacker positioned on the network adjacent to the target to initiate arbitrary server-side requests. Exploitation does not require authentication, increasing the risk of unauthorized internal or external network interactions initiated by the vulnerable server. The Zero Day Initiative assigned this issue CVE-2026-91131 with a CVSS score of 5.4, reflecting a medium severity. No further technical details or exploit code are currently available.

References

zerodayinitiative.com/advisories/ZDI-26-897/ (opens in a new tab)

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