VulnSocial

CVE-2026-2454Disclosure(mattermost / mattermost_server)

LOWCVSS 8.6 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537

mattermost CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-1287

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • mattermost_server

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • 2 total mentions across 1 day

Affected systems

Vendors
mattermost
Products
mattermost_server

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-03-17: 2Technical Details · 2026-03-17: 203-17
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets2 URLs
Full discourse2 posts
  • CVE@CVEnew
    Disclosure

    CVE-2026-2454 Mattermost versions 11.3.x &lt;= 11.3.0, 11.2.x &lt;= 11.2.2, 10.11.x &lt;= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM e… https://www.cve.org/CVERecord?id=CVE-2026-2454

    Post summary

    CVE-2026-2454 exposes an out‑of‑memory flaw in specific Mattermost releases caused by mishandling of array lengths; the entry only discloses the vulnerability without providing PoC, exploit, or patch details.

    0000083
    56.7K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-2454 Mattermost WebSocket Message Handling Vulnerability Causing Denial of Service https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-2454

    Post summary

    The text lists a CVE and a concise description of a WebSocket-based DoS issue, but provides no detailed technical, exploit, or mitigation information.

    0000047
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---

Explore more

Back to dashboardmattermost CVEsmattermost_server vulnerabilities