CVE-2026-88388

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow vulnerability in the JavaScript error stack-trace handling path on 64-bit builds. A remote attacker can supply JavaScript input that triggers an exception and reaches jslPrintTokenLineMarker(), which passes the address of a 4-byte int column variable to jsvGetLineAndCol() as a size_t pointer. jsvGetLineAndCol() performs an 8-byte write through the mismatched pointer, overwriting adjacent stack memory.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

September 24, 2026

Last Modified

September 25, 2026

Advisory Details (1)

Auto-updated Sep 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit ecd7d43e084b (espruino/Espruino)

Fix landed in espruino/Espruino commit ecd7d43e084b — awaiting tagged release

https://github.com/espruino/Espruino/commit/ecd7d43e084ba9aafa8245609347fe0f4383b38c

Vendor Advisories for CVE-2026-88388(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 26× in last 7d / 39× 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. 2026-10-04 08:31 UTCGHSA enrichment
  2. 2026-10-03 20:18 UTCEG score recompute
  3. 2026-10-03 20:18 UTCGHSA enrichment
  4. 2026-10-03 08:03 UTCGHSA enrichment
  5. 2026-10-02 19:51 UTCEG score recompute
  6. 2026-10-02 19:51 UTCGHSA enrichment
  7. 2026-10-02 07:38 UTCEG score recompute
  8. 2026-10-02 07:38 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 19:25 UTCGHSA enrichment
  11. 2026-10-01 07:12 UTCGHSA enrichment
  12. 2026-09-30 18:59 UTCEG score recompute
  13. 2026-09-30 18:59 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-30 06:47 UTCGHSA enrichment
  16. 2026-09-29 18:34 UTCEG score recompute
  17. 2026-09-29 18:34 UTCGHSA enrichment
  18. 2026-09-29 06:14 UTCEG score recompute
  19. 2026-09-29 06:14 UTCGHSA enrichment
  20. 2026-09-28 18:01 UTCEG score recompute
  21. 2026-09-28 18:01 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 05:37 UTCGHSA enrichment
  24. 2026-09-27 17:25 UTCEG score recompute
  25. 2026-09-27 17:25 UTCGHSA enrichment
Show 14 more
  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 05:12 UTCGHSA enrichment
  3. 2026-09-26 16:59 UTCEG score recompute
  4. 2026-09-26 16:59 UTCGHSA enrichment
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-26 04:42 UTCEG score recompute
  7. 2026-09-26 04:42 UTCGHSA enrichment
  8. 2026-09-25 16:26 UTCEG score recompute▲ 7.50
  9. 2026-09-25 16:26 UTCGHSA enrichment
  10. 2026-09-25 16:25 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  11. 2026-09-24 21:37 UTCGHSA enrichment
  12. 2026-09-24 21:22 UTCNVD update
  13. 2026-09-24 20:47 UTCEG score recompute
  14. 2026-09-24 20:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88388?
CVE-2026-88388 is a high vulnerability published on September 24, 2026. Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow vulnerability in the JavaScript error stack-trace handling path on 64-bit builds. A remote attacker can supply JavaScript input that triggers an exception and reaches jslPrintTokenLineMarker(), which passes the address of a…
When was CVE-2026-88388 disclosed?
CVE-2026-88388 was first published on September 24, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88388 actively exploited?
CVE-2026-88388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88388?
CVE-2026-88388 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88388?
An upstream fix for CVE-2026-88388 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-88388 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-88388

Explore →

Is Your Infrastructure Affected by CVE-2026-88388?

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

Book a Demo →Browse All CVEs