A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
CVE-2026-88830
HIGHPre-NVD 7.57.5—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-23. a secondary CVSS source baseline 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(high)
- EG Risk
- 49(Track)EG Risk 49/100SSVC: 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 computedSeverity75% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 23, 2026
Last Modified
September 23, 2026
Advisory Details (2)
Auto-updated Sep 23, 2026Patch available. Sources: redhat.
redhat
2531344 – (CVE-2026-88830) CVE-2026-88830 busybox: busybox: TLS Montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow
https://bugzilla.redhat.com/show_bug.cgi?id=2531344redhat Patch Available
CVE-2026-88830 - 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-2026-88830Vendor Advisories for CVE-2026-88830(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 7× in last 7d / 7× 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.
- 2026-09-23 20:23 UTCEG score recompute
- 2026-09-23 20:23 UTCGHSA enrichment
- 2026-09-23 19:48 UTCEG score recompute
- 2026-09-23 19:48 UTCGHSA enrichment
- 2026-09-23 17:18 UTCEG score recompute
- 2026-09-23 17:14 UTCEG score recompute
- 2026-09-23 17:14 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-131
Frequently asked(4)
What is CVE-2026-88830?
CVE-2026-88830 is a high vulnerability published on September 23, 2026. A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.
When was CVE-2026-88830 disclosed?
CVE-2026-88830 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-88830?
CVE-2026-88830 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-88830?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88830, 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-2026-88830
Is Your Infrastructure Affected by CVE-2026-88830?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.