How severe is CVE-2026-34476?

CVE-2026-34476 has a CVSS score of 7.1/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-34476?

CVE-2026-34476 affects the following packages: github.com/apache/skywalking-mcp (Go). Ecosystems affected: Go.

How do I fix CVE-2026-34476?

Update github.com/apache/skywalking-mcp to 0.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34476 is resolved across your whole dependency graph.

How do I detect CVE-2026-34476 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/apache/skywalking-mcp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-34476 if there is no patch (or I can't update yet)?

Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Is CVE-2026-34476 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-34476 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-34476?

CVE-2026-34476 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 42th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-34476?

CVE-2026-34476 is classified as Server-Side Request Forgery (SSRF) (CWE-918). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-34476 published, and has it been updated?

CVE-2026-34476 was published on April 13, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

HIGH severity

CVE-2026-34476 — skywalking-mcp

HIGH

CVE-2026-34476 is a high-severity (CVSS 7.1) Server-Side Request Forgery (SSRF) vulnerability in github.com/apache/skywalking-mcp. A fix is available for github.com/apache/skywalking-mcp — see the affected versions and patch details below.

Apache SkyWalking MCP: Server-Side Request Forgery via SW-URL Header in MCP Server

Also known asGHSA-c4hg-6933-x62xGO-2026-5310

Published

Apr 13, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-34476.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk+0.01%

Lower risk than most CVEs42th percentile — riskier than 42% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/apache/skywalking-mcp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Server-Side Request Forgery via SW-URL Header vulnerability in Apache SkyWalking MCP.

This issue affects Apache SkyWalking MCP: 0.1.0.

Users are recommended to upgrade to version 0.2.0, which fixes this issue.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/apache/skywalking-mcp`	all versions	0.2.0`go get github.com/apache/skywalking-mcp@v0.2.0`

Affected Products

1 product · 1 configurations

Application

skywalking mcpapache

≥ 0.1.0 && < 0.2.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/apache/skywalking-mcp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/apache/skywalking-mcp to 0.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34476 is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

Server-Side Request Forgery via SW-URL Header vulnerability in Apache SkyWalking MCP. This issue affects Apache SkyWalking MCP: 0.1.0. Users are recommended to upgrade to version 0.2.0, which fixes this issue.

O3 Security · Impact-Aware SCA

Is CVE-2026-34476 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CWE Classification

CWE-918Server-Side Request Forgery (SSRF)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Apr 13, 2026

Last updated

Oct 28, 2026

Identifiers

CVE-2026-34476

GHSA-c4hg-6933-x62x

GO-2026-5310

References

Advisorygithub.com · CVE 2026 34476.json Advisorylists.apache.org · v0k1xyzzbtnpyrwxwyn36pbspr8rhjnr Advisorynvd.nist.gov · CVE 2026 34476 Advisorygithub.com · GHSA c4hg 6933 x62x Webopenwall.com Packagegithub.com · skywalking mcp

Related vulnerabilities

This CVE is high severity; 2 of 8 other CVEs with CWE-918 are rated as high or higher (top: high).

CVE-2026-126062CVE-2026-79914CVE-2026-88983CVE-2026-28385GHSA-7wpf-ch8f-5f4xCVE-2026-54442GHSA-4mfg-r38w-w8fgCVE-2026-118660Browse all CWE-918

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026