CVE-2026-70368

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM 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 — 4 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: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
stunnel43:5.68-2 ... 3:5.78-2 (15 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
stunnel43:5.74-2, 3:5.76-1, 3:5.77-1, 3:5.78-1, 3:5.78-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
stunnel2:3.26-10 ... 3:5.79-2 (20 versions)
  • every version up to 3:5.80-1: fixed in 3:5.80-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 71× 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.

Showing the most recent 100 of 167 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 06:14 UTCEG score recompute
  3. 2026-10-04 06:14 UTCVendor advisory
  4. 2026-10-04 06:14 UTCGHSA enrichment
  5. 2026-10-03 14:26 UTCEPSS rescore
  6. 2026-10-02 17:56 UTCEPSS rescore
  7. 2026-10-02 10:12 UTCEG score recompute
  8. 2026-10-02 10:12 UTCVendor advisory
  9. 2026-10-02 10:12 UTCGHSA enrichment
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-10-01 02:28 UTCEG score recompute
  12. 2026-10-01 02:28 UTCVendor advisory
  13. 2026-10-01 02:28 UTCGHSA enrichment
  14. 2026-09-30 15:03 UTCEPSS rescore
  15. 2026-09-29 06:27 UTCEG score recompute
  16. 2026-09-29 06:27 UTCVendor advisory
  17. 2026-09-29 06:27 UTCGHSA enrichment
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-27 18:05 UTCEG score recompute
  20. 2026-09-27 18:05 UTCVendor advisory
  21. 2026-09-27 18:05 UTCGHSA enrichment
  22. 2026-09-27 13:48 UTCEPSS rescore
  23. 2026-09-26 15:59 UTCEPSS rescore
  24. 2026-09-25 04:42 UTCEG score recompute
  25. 2026-09-25 04:42 UTCGHSA enrichment
Show 75 more
  1. 2026-09-24 01:48 UTCEG score recompute
  2. 2026-09-24 01:48 UTCGHSA enrichment
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-23 02:37 UTCEG score recompute
  5. 2026-09-23 02:37 UTCGHSA enrichment
  6. 2026-09-22 03:27 UTCEG score recompute
  7. 2026-09-22 03:27 UTCGHSA enrichment
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-20 20:16 UTCEPSS rescore
  10. 2026-09-20 03:21 UTCEG score recompute
  11. 2026-09-20 03:21 UTCGHSA enrichment
  12. 2026-09-19 03:41 UTCEG score recompute
  13. 2026-09-19 03:41 UTCGHSA enrichment
  14. 2026-09-18 19:28 UTCEPSS rescore
  15. 2026-09-18 03:36 UTCEG score recompute
  16. 2026-09-18 03:36 UTCGHSA enrichment
  17. 2026-09-17 04:26 UTCEG score recompute
  18. 2026-09-17 04:26 UTCGHSA enrichment
  19. 2026-09-16 14:08 UTCEPSS rescore
  20. 2026-09-16 05:16 UTCEG score recompute
  21. 2026-09-16 05:16 UTCGHSA enrichment
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 03:12 UTCEPSS rescore
  24. 2026-09-15 01:45 UTCGHSA enrichment
  25. 2026-09-14 02:35 UTCEG score recompute
  26. 2026-09-14 02:35 UTCGHSA enrichment
  27. 2026-09-13 03:25 UTCEG score recompute
  28. 2026-09-13 03:25 UTCGHSA enrichment
  29. 2026-09-12 15:02 UTCEPSS rescore
  30. 2026-09-12 04:14 UTCEG score recompute
  31. 2026-09-12 04:14 UTCGHSA enrichment
  32. 2026-09-11 14:53 UTCEPSS rescore
  33. 2026-09-11 05:01 UTCEG score recompute
  34. 2026-09-11 05:01 UTCGHSA enrichment
  35. 2026-09-10 09:35 UTCEPSS rescore
  36. 2026-09-10 05:49 UTCGHSA enrichment
  37. 2026-09-09 06:38 UTCEG score recompute
  38. 2026-09-09 06:38 UTCGHSA enrichment
  39. 2026-09-08 22:01 UTCEPSS rescore
  40. 2026-09-07 18:37 UTCEG score recompute
  41. 2026-09-07 18:37 UTCGHSA enrichment
  42. 2026-09-07 16:01 UTCEPSS rescore
  43. 2026-09-06 13:47 UTCEPSS rescore
  44. 2026-09-06 08:33 UTCEG score recompute
  45. 2026-09-06 08:33 UTCGHSA enrichment
  46. 2026-09-05 15:31 UTCEPSS rescore
  47. 2026-09-05 09:22 UTCEG score recompute
  48. 2026-09-05 09:22 UTCGHSA enrichment
  49. 2026-09-04 10:12 UTCEG score recompute
  50. 2026-09-04 10:12 UTCGHSA enrichment
  51. 2026-09-04 05:07 UTCEPSS rescore
  52. 2026-09-03 08:09 UTCEG score recompute
  53. 2026-09-03 08:09 UTCGHSA enrichment
  54. 2026-09-02 14:12 UTCEPSS rescore
  55. 2026-09-01 22:14 UTCEG score recompute
  56. 2026-09-01 22:14 UTCGHSA enrichment
  57. 2026-09-01 13:54 UTCEPSS rescore
  58. 2026-09-01 04:40 UTCEPSS rescore
  59. 2026-08-31 23:03 UTCGHSA enrichment
  60. 2026-08-30 21:00 UTCEG score recompute
  61. 2026-08-30 21:00 UTCGHSA enrichment
  62. 2026-08-30 19:17 UTCEPSS rescore
  63. 2026-08-30 01:22 UTCEPSS rescore
  64. 2026-08-29 21:49 UTCEG score recompute
  65. 2026-08-29 21:49 UTCGHSA enrichment
  66. 2026-08-28 21:42 UTCEPSS rescore
  67. 2026-08-27 21:47 UTCEG score recompute
  68. 2026-08-27 21:47 UTCGHSA enrichment
  69. 2026-08-26 22:37 UTCEG score recompute
  70. 2026-08-26 22:37 UTCGHSA enrichment
  71. 2026-08-26 14:47 UTCEPSS rescore
  72. 2026-08-25 23:26 UTCEG score recompute
  73. 2026-08-25 23:26 UTCGHSA enrichment
  74. 2026-08-25 13:49 UTCEPSS rescore
  75. 2026-08-25 00:15 UTCEG score recompute

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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 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 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70368?
CVE-2026-70368 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70368?
A fix for CVE-2026-70368 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70368 are linked in the Vendor Advisories panel on this page.

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