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CVE-2026-8975

📛 CVE Title

Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151

⬇ Download JSON ⚠ View as Threat

Description

Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-8975 on 2026-07-01. Shown when MITRE's text differs from the cvelistV5 mirror.

Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Overview

State
PUBLISHED
Assigner (CNA)
mozilla
CVSS severity
high
CVSS score
CVSS 8.8 / 10 8.8 8.8 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Effective score
8.8 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-05-19
Published
2026-05-19 12:30 UTC
Last updated
2026-05-20 15:39 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8975.json
Linked Threat
CVE-2026-8975 — CVE-2026-8975

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
2026-05-19 14:16:54 UTC
NVD last modified
2026-05-20 17:16:31 UTC
NVD CVSS v3.1
CVSS 8.8 / 10 8.8 8.8 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore
2.8 / 10
Impact subscore
5.9 / 10
EPSS score
0.0004 (probability of exploitation in next 30 days)
EPSS percentile
13.12% 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 00:32 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-2026-30926
Assigner
mozilla
Published
May 19, 2026, 12:30:24 PM
Updated
May 26, 2026, 5:47:38 PM
EUVD base score (CVSS 3.1)
8.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EUVD-reported EPSS
0.0500
Aliases
GHSA-v6hv-5rrm-2f28

ENISA description: Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

EUVD references (6)

Affected products (2)
VendorProductVersionsPlatforms
Mozilla Firefox 115.36 (unaffected), 140.11 (unaffected), 151 (unaffected) —
Mozilla Thunderbird 140.11 (unaffected), 151 (unaffected) —

Affected products — CPE 2.3 (4) 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:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

Vendor references (6)

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

Web references (16)

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 (6)

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 (19)

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

  • Microsoft and Adobe Patch Tuesday, April 2026 Security Update Review
    web:blog.qualys.com

    With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.

    2026-05-23 22:18 UTC
  • Patch Tuesday, May 2026 Edition - Krebs on Security
    web:krebsonsecurity.com

    Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

    2026-05-23 22:18 UTC
  • Security Update Guide - Microsoft
    web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-05-23 22:18 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 22:18 UTC
  • Microsoft Issues Second Biggest Patch Tuesday Ever in April
    web:redmondmag.com

    Microsoft April 2026 Patch Tuesday fixed 163 CVEs , marking its second-largest security update. Three zero-day vulnerabilities impacted SharePoint, Chromium-based Edge workflows and Microsoft Defender.

    2026-05-23 22:18 UTC
  • Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...
    web:support.servicenow.com

    Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

    2026-05-23 22:18 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-05-23 22:18 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-05-23 22:18 UTC
  • Vulnerability Remediation vs. Mitigation: What are the Differences ...
    web:www.secure.com

    Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

    2026-05-23 22:18 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-23 22:18 UTC
  • CVE-2026-8975 - Vulnerability Details - OpenCVE
    web:app.opencve.io

    Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Update Mozilla Thunderbird to version 151 or newer, or to the newer supported version 140.11, to apply the memory safety fixes. Apply the same update to Mozilla Firefox, installing version 151, Firefox ESR 115.36, or Firefox ESR 140.11.

    2026-05-26 02:58 UTC
  • Nvd - Cve-2026-8975
    web:nvd.nist.gov

    An official website of the United States government Here's how you know

    2026-05-26 02:58 UTC
  • CVE-2026-8975 - security-tracker.debian.org
    web:security-tracker.debian.org

    Vulnerable and fixed packages The table below lists information on source packages.

    2026-05-26 02:58 UTC
  • Addressing Exchange Server May 2026 vulnerability CVE-2026-42897
    web:techcommunity.microsoft.com

    We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE - 2026 -42897.

    2026-05-26 02:58 UTC
  • CVE-2026-8975 - vulmon.com
    web:vulmon.com

    Vulnerability details of CVE-2026-8975 CVE-2026-8975 - Memory Safety Bugs in Thunderbird 140.10 and 150 Enabling Arbitrary Code Execution

    2026-05-26 02:58 UTC
  • CVE-2026-42897 Exchange OWA Mitigation M2: What Admins Must Verify
    web:windowsforum.com

    Microsoft's Fastest Fix Is a Mitigation , Not a Patch The important detail in Microsoft's May 14 notice is that there is no permanent Exchange security update available yet for CVE - 2026 -42897. Microsoft says it is working on one and will release it later for affected supported paths, but today's defensive action is mitigation .

    2026-05-26 02:58 UTC
  • Microsoft Confirms Active 0-Day Exploit—Check Emergency Mitigation
    web:www.forbes.com

    Microsoft Exchange users are urged to mitigate a zero-day vulnerability that CISA has confirmed is under active exploitation.

    2026-05-26 02:58 UTC
  • CVE-2026-8975 | Tenable®
    web:www.tenable.com

    Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

    2026-05-26 02:58 UTC
  • CVE-2026-8975 - High Vulnerability - TheHackerWire
    web:www.thehackerwire.com

    To protect against CVE-2026-8975 , you should: (1) Apply the latest security patches from Mozilla, (2) Check official security advisories for specific remediation steps, (3) Update affected software to the latest version, and (4) Monitor your systems for any signs of exploitation.

    2026-05-26 02:58 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-8975.json.

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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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