P4Verified

CVE-2026-77088: justhtml 0.9.0 through 1.21.0

CVE-2026-77088. CVSS 3.1 base score 6.1 (MEDIUM, Vendor/CNA). EPSS 0.00263 (percentile 0.16693), scored 11-Oct-2026.

Affected technology

justhtml · 0.9.0 through 1.21.0
EmilStenstrom

Description’s affected range: versions 0.9.0 through 1.21.0

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · Passive user interaction

What an attacker can do

Attackers can inject blank lines into code or pre element text to break the inline span, causing sanitized HTML to be emitted unescaped and re-parsed as live Markdown by compliant renderers. Vendor/CNA’s CVSS 4.0 assessment (base score 5.3/10) rates confidentiality and integrity impact as low; availability impact as none.

Published 12-Oct-2026 16:55 UTC

CWE: CWE-79
CCR priority: 24.5 /100 (P4)
CVSS 3.1: 6.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · Vendor/CNA
EPSS: 0.00263 · percentile 0.16693 · 2026-10-11
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-12 16:54:24.294989+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-77088.html