CVE-2026-70368

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-04. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing "\n" characters with "\0".

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
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

2462029 – (CVE-2026-70368) CVE-2026-70368 stunnel: Stack-based out-of-bounds read/write in stunnel s_vlog via oversized log message

https://bugzilla.redhat.com/show_bug.cgi?id=2462029
redhat Patch Available

CVE-2026-70368 - 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-2026-70368

Vendor Advisories for CVE-2026-70368(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 25× in last 7d / 59× 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. 2026-08-21 03:32 UTCEG score recompute
  2. 2026-08-21 03:32 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 04:22 UTCEG score recompute
  5. 2026-08-20 04:22 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 05:10 UTCEG score recompute
  8. 2026-08-19 05:09 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 05:53 UTCEG score recompute
  12. 2026-08-18 05:53 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 06:43 UTCEG score recompute
  15. 2026-08-17 06:43 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 07:33 UTCEG score recompute
  19. 2026-08-16 07:33 UTCGHSA enrichment
  20. 2026-08-16 02:15 UTCEPSS rescore
  21. 2026-08-15 08:23 UTCEG score recompute
  22. 2026-08-15 08:23 UTCGHSA enrichment
  23. 2026-08-15 01:31 UTCEPSS rescore
  24. 2026-08-14 09:12 UTCEG score recompute
  25. 2026-08-14 09:12 UTCGHSA enrichment
Show 34 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 10:02 UTCEG score recompute
  3. 2026-08-13 10:02 UTCGHSA enrichment
  4. 2026-08-12 13:51 UTCEPSS rescore
  5. 2026-08-12 10:52 UTCEG score recompute
  6. 2026-08-12 10:52 UTCGHSA enrichment
  7. 2026-08-11 11:41 UTCEG score recompute
  8. 2026-08-11 11:41 UTCGHSA enrichment
  9. 2026-08-11 00:00 UTCEPSS rescore
  10. 2026-08-10 12:31 UTCEG score recompute
  11. 2026-08-10 12:31 UTCGHSA enrichment
  12. 2026-08-09 13:47 UTCEPSS rescore
  13. 2026-08-09 13:21 UTCEG score recompute
  14. 2026-08-09 13:21 UTCGHSA enrichment
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-08 14:11 UTCEG score recompute
  17. 2026-08-08 14:11 UTCGHSA enrichment
  18. 2026-08-07 15:00 UTCGHSA enrichment
  19. 2026-08-06 15:50 UTCEG score recompute
  20. 2026-08-06 15:50 UTCGHSA enrichment
  21. 2026-08-06 13:47 UTCEPSS rescore
  22. 2026-08-06 08:22 UTCEG score recompute
  23. 2026-08-06 08:22 UTCGHSA enrichment
  24. 2026-08-06 08:10 UTCEG score recompute
  25. 2026-08-06 08:10 UTCGHSA enrichment
  26. 2026-08-05 19:17 UTCEPSS rescore
  27. 2026-08-05 19:17 UTCEPSS rescore
  28. 2026-08-05 14:30 UTCEG score recompute
  29. 2026-08-05 14:30 UTCGHSA enrichment
  30. 2026-08-04 15:20 UTCEG score recompute
  31. 2026-08-04 14:48 UTCEG score recompute
  32. 2026-08-04 14:18 UTCEG score recompute
  33. 2026-08-04 13:59 UTCEG score recompute
  34. 2026-08-04 13:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70368?
CVE-2026-70368 is a medium vulnerability published on August 4, 2026. A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an…
When was CVE-2026-70368 disclosed?
CVE-2026-70368 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-2026-70368 actively exploited?
CVE-2026-70368 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 71.4% of all scored CVEs.
What is the CVSS score of CVE-2026-70368?
CVE-2026-70368 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-70368?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70368, 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-2026-70368

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