Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate 7zip archive structure before processing which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted 7zip file with excessive folder declarations.. Mattermost Advisory ID: MMSA-2026-00573
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
⚡ New CVE Alert: CVE-2026-6340 📊 Severity: 4.3 🚨 Risk Level: Medium 🧩 Affects: Multiple / Unspecified Products Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-6340 #CVE-2026-6340 #CVE #Medium #CyberSecurity #InfoSec https://t.co/xJZEIPXTmB
Post summary
The tweet announces a new CVE (CVE-2026-6340) with a moderate severity score, but it lacks any technical, exploit, or mitigation details.
CVE-2026-6340 Denial of Service via Malformed 7zip Archive in Mattermost Versions 11.5.1 and Earlier https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-6340
Post summary
The post announces a new Denial of Service vulnerability (CVE‑2026‑6340) in older Mattermost versions caused by malformed 7zip archives, but provides no PoC, exploit code, or active exploitation evidence.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | mattermost | mattermost_server | - | - | - |