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CVE-2026-8093

📛 CVE Title

Memory safety bugs fixed in Thunderbird 150.0.2

⬇ Download JSON ⚠ View as Threat

Description

Memory safety bugs present in Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2.

Overview

State
PUBLISHED
Assigner (CNA)
mozilla
CVSS severity
high
CVSS score
CVSS 8.1 / 10 8.1 8.1 / 10
CVSS vector
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Effective score
8.1 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-05-07
Published
2026-05-07 14:45 UTC
Last updated
2026-05-08 16:11 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8093.json
Linked Threat
CVE-2026-8093 — CVE-2026-8093

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-07 13:16:14 UTC
NVD last modified
2026-05-18 08:16:15 UTC
NVD CVSS v3.1
CVSS 8.1 / 10 8.1 8.1 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore
2.2 / 10
Impact subscore
5.9 / 10
EPSS score
0.0002 (probability of exploitation in next 30 days)
EPSS percentile
5.46% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-119 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-05-25 06:23 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-28364
Assigner
mozilla
Published
May 7, 2026, 12:45:07 PM
Updated
May 18, 2026, 7:32:31 AM
EUVD base score (CVSS 3.1)
8.1 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS
0.0200
Vendors
Mozilla
Products
Firefox

ENISA description: Memory safety bugs present in Firefox 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2.

EUVD references (3)

Affected products (2)
VendorProductVersionsPlatforms
Mozilla Firefox 150.0.2 (unaffected) —
Mozilla Thunderbird 150.0.2 (unaffected) —

Affected products — CPE 2.3 (2) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

MITRE references (3) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (10)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (12)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-8093.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.1,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-8093",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-08T03:55:46.999892Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-119",
                "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-08T14:11:00.862Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "150.0.2",
              "versionType": "rpm"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "150.0.2",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Andy Leiserson, Jan de Mooij, Michael Froman and the Mozilla Fuzzing Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Memory safety bugs present in Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2."
            }
          ],
          "value": "Memory safety bugs present in Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2 and Thunderbird 150.0.2."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T12:19:03.691Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "name": "Memory safety bugs fixed in Thunderbird 150.0.2",
          "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1981270%2C2027154%2C2028332%2C2029327%2C2029428%2C2029894%2C2032189%2C2034837%2C2035968%2C2036256"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-40/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-43/"
        }
      ],
      "title": "Memory safety bugs fixed in Thunderbird 150.0.2"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-8093",
    "datePublished": "2026-05-07T12:45:07.540Z",
    "dateReserved": "2026-05-07T12:45:07.174Z",
    "dateUpdated": "2026-05-08T14:11:00.862Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}