What’s Vulnerable › Vulnerabilities

CVE-2026-88830: Busybox: busybox: tls montgomery reduction allocates bytes instead of digits, causing a pre-auth heap buffer overflow

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-23 · updated 2026-09-23
• Weakness: CWE-131

Description

A unit confusion in BusyBox TLS Montgomery reduction buffer allocation causes a pre-authentication heap buffer overflow when processing a crafted ClientKeyExchange message.

Affected products

• Red Hat Hardened Images: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-88830
• https://bugzilla.redhat.com/show_bug.cgi?id=2531344

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