Vulnerability-Lookup

CVE-2026-3114 (GCVE-0-2026-3114)

Vulnerability from cvelistv5 – Published: 2026-03-26 16:21 – Updated: 2026-03-26 17:51

Title

Zip Bomb Denial of Service via Unrestricted Archive Decompression

Summary

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory.. Mattermost Advisory ID: MMSA-2026-00598

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

Mattermost

References

URL

Tags

https://mattermost.com/security-updates

vendor-advisory

Impacted products

	Vendor	Product	Version
	Mattermost	Mattermost	Affected: 11.4.0 , ≤ 11.4.0 (semver) Affected: 11.3.0 , ≤ 11.3.1 (semver) Affected: 11.2.0 , ≤ 11.2.3 (semver) Affected: 10.11.0 , ≤ 10.11.11 (semver) Unaffected: 11.5.0 Unaffected: 11.4.1 Unaffected: 11.3.2 Unaffected: 11.2.4 Unaffected: 10.11.12

Credits

winfunc

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-3114

Vulnerability from fkie_nvd - Published: 2026-03-26 17:16 - Updated: 2026-03-30 19:40

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	responsibledisclosure@mattermost.com	https://mattermost.com/security-updates	Vendor Advisory

Impacted products

Vendor	Product	Version
mattermost	mattermost_server	*
mattermost	mattermost_server	*
mattermost	mattermost_server	*
mattermost	mattermost_server	11.4.0

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D144BD1D-F65C-498D-BC8A-F3D718F47F4B",
              "versionEndExcluding": "10.11.12",
              "versionStartIncluding": "10.11.0",
              "vulnerable": true
            },
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              "matchCriteriaId": "2E3E9B61-F003-45E4-9A04-8015A5CB8558",
              "versionEndExcluding": "11.2.4",
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            },
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              "versionStartIncluding": "11.3.0",
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    },
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      "lang": "es",
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          "integrityImpact": "NONE",
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GHSA-VHGH-G7X8-4RX8

Vulnerability from github – Published: 2026-03-26 18:31 – Updated: 2026-03-31 23:05

Summary

Mattermost doesn't validate decompressed archive entry sizes during file extraction

Details

Severity ?

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/mattermost/mattermost/server/v8"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.4.0"
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              "fixed": "11.4.1"
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      "versions": [
        "11.4.0"
      ]
    },
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      },
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              "introduced": "8.0.0-20260105080200-d27a2195068d"
            },
            {
              "fixed": "8.0.0-20260217110922-b7d4a1f1f59b"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-3114"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:05:48Z",
    "nvd_published_at": "2026-03-26T17:16:42Z",
    "severity": "MODERATE"
  },
  "details": "Mattermost versions 11.4.x \u003c= 11.4.0, 11.3.x \u003c= 11.3.1, 11.2.x \u003c= 11.2.3, 10.11.x \u003c= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory. Mattermost Advisory ID: MMSA-2026-00598.",
  "id": "GHSA-vhgh-g7x8-4rx8",
  "modified": "2026-03-31T23:05:48Z",
  "published": "2026-03-26T18:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3114"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mattermost/mattermost"
    },
    {
      "type": "WEB",
      "url": "https://mattermost.com/security-updates"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mattermost doesn\u0027t validate decompressed archive entry sizes during file extraction"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-3114 (GCVE-0-2026-3114)

FKIE_CVE-2026-3114

GHSA-VHGH-G7X8-4RX8

Tags

Sightings

Nomenclature