CVE-2026-70367

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-04. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A Server-Side Request Forgery (SSRF) bypass vulnerability exists in “stunnel” 5.79 and lower when configured in SOCKS proxy mode. This flaw allows a client to bypass intended localhost restrictions by using IPv4-mapped IPv6 addresses (e.g., “::ffff:127.0.0.1”) or unspecified addresses ("0.0.0.0", "::"), enabling access to loopback-only services on the "stunnel" host that should not be network-reachable.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 6, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
Patch available. Sources: redhat.
redhat

2462083 – (CVE-2026-70367) CVE-2026-70367 stunnel: SSRF bypass in stunnel SOCKS proxy via IPv4-mapped IPv6 loopback and unspecified addresses allows access to loopback-only services

https://bugzilla.redhat.com/show_bug.cgi?id=2462083
redhat Patch Available

CVE-2026-70367 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-70367

Vendor Advisories for CVE-2026-70367(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
stunnel2:3.26-10 ... 3:5.79-2 (20 versions)3:5.80-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 54× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-19 18:56 UTCEG score recompute
  2. 2026-08-19 18:56 UTCGHSA enrichment
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 15:48 UTCEG score recompute
  5. 2026-08-18 15:48 UTCGHSA enrichment
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-18 13:49 UTCEPSS rescore
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-17 12:48 UTCEG score recompute
  10. 2026-08-17 12:48 UTCGHSA enrichment
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 10:42 UTCEG score recompute
  14. 2026-08-16 10:42 UTCGHSA enrichment
  15. 2026-08-16 02:15 UTCEPSS rescore
  16. 2026-08-15 08:37 UTCEG score recompute
  17. 2026-08-15 08:37 UTCGHSA enrichment
  18. 2026-08-15 01:31 UTCEPSS rescore
  19. 2026-08-14 06:30 UTCEG score recompute
  20. 2026-08-14 06:30 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 04:24 UTCEG score recompute
  23. 2026-08-13 04:24 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 02:19 UTCEG score recompute
Show 29 more
  1. 2026-08-12 02:19 UTCGHSA enrichment
  2. 2026-08-11 00:13 UTCEG score recompute
  3. 2026-08-11 00:13 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-09 22:07 UTCEG score recompute
  6. 2026-08-09 22:07 UTCGHSA enrichment
  7. 2026-08-09 13:47 UTCEPSS rescore
  8. 2026-08-08 20:02 UTCEG score recompute
  9. 2026-08-08 20:02 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 17:56 UTCEG score recompute
  12. 2026-08-07 17:56 UTCGHSA enrichment
  13. 2026-08-06 15:50 UTCEG score recompute
  14. 2026-08-06 15:50 UTCGHSA enrichment
  15. 2026-08-06 13:47 UTCEPSS rescore
  16. 2026-08-06 08:22 UTCEG score recompute
  17. 2026-08-06 08:22 UTCGHSA enrichment
  18. 2026-08-06 08:10 UTCEG score recompute
  19. 2026-08-06 08:10 UTCGHSA enrichment
  20. 2026-08-05 19:17 UTCEPSS rescore
  21. 2026-08-05 19:17 UTCEPSS rescore
  22. 2026-08-05 18:39 UTCGHSA enrichment
  23. 2026-08-04 16:33 UTCEG score recompute
  24. 2026-08-04 16:33 UTCGHSA enrichment
  25. 2026-08-04 15:37 UTCEG score recompute
  26. 2026-08-04 15:37 UTCGHSA enrichment
  27. 2026-08-04 14:18 UTCEG score recompute
  28. 2026-08-04 13:59 UTCEG score recompute
  29. 2026-08-04 13:57 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-70367?
CVE-2026-70367 is a medium vulnerability published on August 4, 2026. A Server-Side Request Forgery (SSRF) bypass vulnerability exists in “stunnel” 5.79 and lower when configured in SOCKS proxy mode. This flaw allows a client to bypass intended localhost restrictions by using IPv4-mapped IPv6 addresses (e.g., “::ffff:127.0.0.1”) or unspecified addresses ("0.0.0.0",…
When was CVE-2026-70367 disclosed?
CVE-2026-70367 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70367 actively exploited?
CVE-2026-70367 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.8% of all scored CVEs.
What is the CVSS score of CVE-2026-70367?
CVE-2026-70367 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-70367?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70367, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-70367

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