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Portkey AI Gateway CVE-2026-82270

| EUVDEUVD-2026-67801 HIGH
Server-Side Request Forgery (SSRF) (CWE-918)
2026-08-28 VulnCheck GHSA-rv66-rgwx-xfrj
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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
vuln.today AI
7.5 HIGH

Network-reachable unauthenticated route; no integrity or availability impact described; confidentiality high due to API key exfiltration; scope unchanged as primary impact remains within gateway credential domain.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 28, 2026 - 20:31 vuln.today
CVE Published
Aug 28, 2026 - 16:18 cve.org
HIGH 8.7

DescriptionCVE.org

Portkey AI Gateway through 1.15.2 contains a server-side request forgery vulnerability in the /v1/proxy/* route that lacks requestValidator middleware. Attackers can set the x-portkey-custom-host header to internal addresses and forward requests with Authorization headers to reach internal services and exfiltrate provider API keys.

AnalysisAI

Server-side request forgery in Portkey AI Gateway through version 1.15.2 enables unauthenticated remote attackers to weaponize the gateway as an internal network proxy by injecting arbitrary host values into the x-portkey-custom-host header on the /v1/proxy/* route, which lacks requestValidator middleware. The gateway faithfully forwards outbound requests - including Authorization headers carrying LLM provider API keys - to attacker-specified internal addresses, enabling credential exfiltration and internal service enumeration. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires network access to the Portkey AI Gateway's /v1/proxy/* route, which is the gateway's standard proxying interface and is expected to be network-accessible in typical deployments. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) places this in the high-priority tier: the attack is network-reachable, requires no privileges, no user interaction, and no special attack requirements, with high confidentiality impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No patched release version has been independently confirmed at time of analysis; operators should monitor the GitHub repository at https://github.com/Portkey-AI/gateway and issue #1718 at https://github.com/Portkey-AI/gateway/issues/1718 for a fix release and upgrade immediately upon availability. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all Portkey AI Gateway deployments and immediately restrict network access to /v1/proxy/* endpoints if internet-exposed; simultaneously rotate all LLM provider API keys that may traverse the gateway. …

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CVE-2026-82270 vulnerability details – vuln.today

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