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MEDIUM severity

CVE-2026-47768 — nebula-mesh

MEDIUM

CVE-2026-47768 is a medium-severity (CVSS 5.5) CWE-598 vulnerability in github.com/juev/nebula-mesh. A fix is available for github.com/juev/nebula-mesh — see the affected versions and patch details below.

nebula-mesh: Newly-minted operator API key exposed in redirect URL (Referer, history, proxy logs)

Also known asGHSA-9pg3-25fq-p6ccGO-2026-5294
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs4th percentile — riskier than 4% of all scored CVEsHighest risk
0.00%0.22%0.44%0.65%0.1%0.1%0.2%0.2%Aug 26Oct 26Oct 26

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

How urgent is this, really

CVE-2026-47768 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/juev/nebula-mesh

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

internal/web/operators.go:251 — after handleOperatorCreateAPIKey mints a fresh 32-byte bearer token, the redirect points the operator's browser at:

/ui/operators/<id>?new_key=<raw-token>&key_name=<name>

The raw API key ends up:

  • in the browser's URL history
  • in the Referer header on every cross-origin asset the detail page loads (any third-party SVG/CSS/JS resource the layout pulls in)
  • in any reverse-proxy or load-balancer access log on the path (nginx default combined log captures the query string)
  • in any structured log sink the operator's local browser-history backup tool ships out

Authorization: Bearer <token> headers go through the same hops without these problems because access logs typically don't capture request headers and the browser doesn't replay headers cross-origin.

Same handler also appends name (r.FormValue("name")) to the query string without url.QueryEscape, so an & in the operator-supplied key name corrupts query parsing and a \r\n in older proxies could split response headers.

Affected

All released versions up to v0.3.1.

Reproducer

As admin, create an API key via /ui/operators/<id>/api-keys (form POST). The 303 Location header carries the raw token in the query string. Open browser DevTools → Network → response headers; or check the reverse-proxy access log; or check the operator-detail page's Referer-emitting fetches.

Suggested fix

Stash the raw key in a one-shot server-side flash storage (e.g., a row in operator_sessions keyed by session token, with a one_shot_token column and consumed_at) or in a short-lived signed cookie. Render the key once inline on the detail page after the redirect, and clear the storage on render. Pattern mirrors the recovery-codes display in the TOTP flow.

If the flash-storage refactor is too invasive, the minimal fix is to render the key inline via a POST → 200 OK with HTML (no redirect), losing the post-redirect-get idiom but eliminating the URL exposure.

Also fix name query encoding with url.QueryEscape regardless of which fix shape lands.

CVSS estimate

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N — 5.5 (medium). AV:L because realistic exploit requires log-read access on shared infrastructure (proxy, CDN, browser-history backup) the operator's session touches.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/juev/nebula-meshall versions0.3.2go get github.com/juev/nebula-mesh@v0.3.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update github.com/juev/nebula-mesh to 0.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-47768 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

`internal/web/operators.go:251` — after `handleOperatorCreateAPIKey` mints a fresh 32-byte bearer token, the redirect points the operator's browser at: /ui/operators/<id>?new_key=<raw-token>&key_name=<name> The raw API key ends up: - in the browser's URL history - in the `Referer` header on every cross-origin asset the detail page loads (any third-party SVG/CSS/JS resource the layout pulls in) - in any reverse-proxy or load-balancer access log on the path (nginx default `combined` log captures the query string) - in any structured log sink the operator's local browser-history backup tool
O3 Security · Impact-Aware SCA

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CVE-2026-47768: nebula-mesh — Fixed in 0.3.2