CVE-2026-58317

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-07-17. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

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

Unsigned to Signed Conversion Error (CWE-196) vulnerability exists in TTSSH2 plugin of Tera Term provided by TeraTerm Project. When Tera Term attempts to establish an SSH connection to a server set up by an attacker, out-of-bounds read/write may occur. As a result, the contents of adjacent memory regions may be transmitted to the server, and Tera Term may behave unexpected or terminate abnormally.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

July 17, 2026

Last Modified

July 17, 2026

Advisory Details (3)

Auto-updated Jul 17, 2026
No patch confirmed yet.
generic

TTSSH2 のメモリ境界外アクセスの脆弱性

https://teratermproject.github.io/SA/JVN65294474.html
generic

TTSSH2 has out-of-bounds access vulnerability

https://teratermproject.github.io/SA/JVN65294474-en.html
generic

JVN#65294474: Multiple vulnerabilities in TTSSH2 plugin of Tera Term

https://jvn.jp/en/jp/JVN65294474/

Vendor Advisories for CVE-2026-58317(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 32× 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. 2026-07-27 09:40 UTCEG score recompute
  2. 2026-07-27 09:40 UTCGHSA enrichment
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 11:20 UTCEG score recompute
  6. 2026-07-26 11:20 UTCGHSA enrichment
  7. 2026-07-25 14:18 UTCEPSS rescore
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-24 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 03:21 UTCEG score recompute
  14. 2026-07-22 14:08 UTCEPSS rescore
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-20 17:08 UTCEPSS rescore
  17. 2026-07-19 14:31 UTCEPSS rescore
  18. 2026-07-19 14:31 UTCEPSS rescore
  19. 2026-07-19 02:29 UTCEPSS rescore
  20. 2026-07-18 12:02 UTCEG score recompute
  21. 2026-07-18 12:01 UTCGHSA enrichment
  22. 2026-07-18 10:04 UTCEPSS rescore
  23. 2026-07-17 19:30 UTCGHSA enrichment
  24. 2026-07-17 18:57 UTCGHSA enrichment
  25. 2026-07-17 18:53 UTCGHSA enrichment
Show 7 more
  1. 2026-07-17 16:09 UTCEG score recompute
  2. 2026-07-17 16:08 UTCGHSA enrichment
  3. 2026-07-17 13:35 UTCEG score recompute
  4. 2026-07-17 13:35 UTCGHSA enrichment
  5. 2026-07-17 06:53 UTCGHSA enrichment
  6. 2026-07-17 04:50 UTCEG score recompute
  7. 2026-07-17 04:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58317?
CVE-2026-58317 is a medium vulnerability published on July 17, 2026. Unsigned to Signed Conversion Error (CWE-196) vulnerability exists in TTSSH2 plugin of Tera Term provided by TeraTerm Project. When Tera Term attempts to establish an SSH connection to a server set up by an attacker, out-of-bounds read/write may occur. As a result, the contents of adjacent memory…
When was CVE-2026-58317 disclosed?
CVE-2026-58317 was first published in the National Vulnerability Database on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58317 actively exploited?
CVE-2026-58317 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 92.0% of all scored CVEs.
What is the CVSS score of CVE-2026-58317?
CVE-2026-58317 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-58317?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58317, 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

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