Vulnerability in glances (CVE-2026-68517)
Summary
Vulnerability in glances (CVE-2026-68517). Confidential information can be exposed externally. Exploitable via CORSMiddleware. Mitigation: upgrade to 4.5.6 or later.
Original description
The description as published by the source.
Summary
Glances's REST API server includes a documented safety check intended to guarantee that cors_credentials=True can never be combined with an unrestricted CORS origin allowlist. The check compares the configured origin list to the wildcard using exact list equality (cors_origins == ["*"]) instead of a membership test. Any multi-entry origin configuration that merely includes "*" alongside other origins (e.g. cors_origins=*,https://trusted.example.com) bypasses the check entirely, while Starlette's underlying CORSMiddleware still treats the presence of "*" anywhere in the list as "allow all origins" and reflects the request's actual Origin header together with Access-Control-Allow-Credentials: true. This allows any website to read a victim's authenticated Glances monitoring data — including full process lists with command-line arguments — by exploiting the browser's automatic replay of cached HTTP Basic Auth credentials in a cross-origin request.
Details
glances/outputs/glances_restful_api.py:298:
if cors_origins == ["*"] and cors_credentials:
logger.warning(...)
cors_credentials = False
The intended guarantee is documented in glances/outputs/glances_stdout_api_restful_doc.py:247-260: "Setting cors_credentials=True with cors_origins= is not allowed. Glances will automatically disable credentials and log a warning if this combination is detected."* The exact-equality comparison only matches when cors_origins is precis…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-68517 has been found in glances.
Attackers can target a specific entry point like CORSMiddleware over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade glances to 4.5.6 or later.
If unsure, ask your IT team or search "glances CVE-2026-68517" on the vendor's site.
CVE-2026-68517 (glances) — CWE-942 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: CORSMiddleware / Origin / cors_origins
Patched: 4.5.6 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-942) exists in glances. Attackers reach the vulnerable code path via CORSMiddleware without authentication.
Check the vendor advisory for the affected versions of glances. Attack surface: CORSMiddleware / Origin / cors_origins.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 4.5.6.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'glances' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'glances' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
glancesを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade glances to 4.5.6ステージング環境で 4.5.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-68517 glances
- Ubuntu UBUNTU-CVE-2026-68517 glances
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com