CVE-2026-55137

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 28, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55137

Vendor Advisories for CVE-2026-55137(2)

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 30× in last 7d / 56× 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. 2026-07-29 10:44 UTCVendor advisory
  2. 2026-07-29 10:44 UTCGHSA enrichment
  3. 2026-07-28 21:40 UTCVendor advisory
  4. 2026-07-28 21:39 UTCGHSA enrichment
  5. 2026-07-28 15:54 UTCEG score recompute
  6. 2026-07-28 15:54 UTCVendor advisory
  7. 2026-07-28 15:53 UTCGHSA enrichment
  8. 2026-07-28 15:37 UTCEPSS rescore
  9. 2026-07-28 13:08 UTCVendor advisory
  10. 2026-07-28 13:08 UTCGHSA enrichment
  11. 2026-07-28 00:05 UTCVendor advisory
  12. 2026-07-28 00:05 UTCGHSA enrichment
  13. 2026-07-27 22:21 UTCVendor advisory
  14. 2026-07-27 22:21 UTCGHSA enrichment
  15. 2026-07-27 16:23 UTCEG score recompute
  16. 2026-07-27 16:23 UTCVendor advisory
  17. 2026-07-27 16:23 UTCGHSA enrichment
  18. 2026-07-27 06:58 UTCVendor advisory
  19. 2026-07-27 06:58 UTCGHSA enrichment
  20. 2026-07-26 17:53 UTCEG score recompute
  21. 2026-07-26 17:53 UTCVendor advisory
  22. 2026-07-26 17:53 UTCGHSA enrichment
  23. 2026-07-26 14:54 UTCEPSS rescore
  24. 2026-07-26 04:48 UTCEG score recompute
  25. 2026-07-26 04:48 UTCVendor advisory
Show 31 more
  1. 2026-07-26 04:48 UTCGHSA enrichment
  2. 2026-07-25 14:18 UTCEPSS rescore
  3. 2026-07-24 14:18 UTCEPSS rescore
  4. 2026-07-23 14:18 UTCEPSS rescore
  5. 2026-07-23 03:20 UTCEG score recompute
  6. 2026-07-22 14:08 UTCEPSS rescore
  7. 2026-07-20 17:08 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:53 UTCEG score recompute
  11. 2026-07-19 02:53 UTCVendor advisory
  12. 2026-07-19 02:53 UTCGHSA enrichment
  13. 2026-07-19 02:29 UTCEPSS rescore
  14. 2026-07-18 10:04 UTCEPSS rescore
  15. 2026-07-17 07:38 UTCEG score recompute
  16. 2026-07-17 07:38 UTCVendor advisory
  17. 2026-07-17 07:38 UTCGHSA enrichment
  18. 2026-07-16 21:56 UTCVendor advisory
  19. 2026-07-16 21:56 UTCGHSA enrichment
  20. 2026-07-16 17:03 UTCEPSS rescore
  21. 2026-07-16 08:53 UTCVendor advisory
  22. 2026-07-16 08:53 UTCGHSA enrichment
  23. 2026-07-15 19:50 UTCVendor advisory
  24. 2026-07-15 19:50 UTCGHSA enrichment
  25. 2026-07-15 16:57 UTCEPSS rescore
  26. 2026-07-15 16:57 UTCEPSS rescore
  27. 2026-07-15 06:46 UTCVendor advisory
  28. 2026-07-15 06:46 UTCGHSA enrichment
  29. 2026-07-14 17:43 UTCEG score recompute
  30. 2026-07-14 17:43 UTCVendor advisory
  31. 2026-07-14 17:40 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55137?
CVE-2026-55137 is a high vulnerability published on July 14, 2026. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
When was CVE-2026-55137 disclosed?
CVE-2026-55137 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55137 actively exploited?
CVE-2026-55137 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 77.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55137?
CVE-2026-55137 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-55137?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55137, 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

Explore the affected products and dependency analysis for CVE-2026-55137

Explore →

Is Your Infrastructure Affected by CVE-2026-55137?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs