CVE-2026-8954

HIGHNVD 7.57.5—Trending — Patch released this week

7.5

Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3: 7.5
EG Score: 7.5(high)
EPSS: 14.0%
KEV: Not listed

Published

May 19, 2026

Last Modified

May 19, 2026

Advisory Details (5)

Auto-updated May 19, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-51/

generic

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-50/

generic

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-48/

generic

Security Vulnerabilities fixed in Firefox 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-46/

generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2030747

Vendor Advisories for CVE-2026-8954(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	thunderbird-0:140.11.0-1.el8_10	2026-06-03	redhat
redhat	thunderbird-0:140.11.0-1.el10_2	2026-06-01	redhat
redhat	firefox-0:140.11.0-1.el10_2	2026-05-27	redhat
redhat	firefox-0:140.11.0-1.el8_10	2026-05-27	redhat
redhat	firefox-0:140.11.0-1.el9_8	2026-05-27	redhat
redhat	thunderbird-0:140.11.0-1.el9_8	2026-05-27	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-119Buffer Operations Within Bounds (Buffer Overflow)

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Red HatRHSA-2026:22643MODERATE2026-05-19
RHSA-2026:22643 — Moderate

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-03 12:49 UTCEG score recompute
2026-06-03 12:49 UTCVendor advisory
2026-06-03 12:49 UTCGHSA enrichment
2026-06-03 01:40 UTCEG score recompute
2026-06-03 01:40 UTCVendor advisory
2026-06-03 01:40 UTCGHSA enrichment
2026-06-02 20:13 UTCepss_batch
2026-06-02 14:31 UTCEG score recompute
2026-06-02 14:31 UTCVendor advisory
2026-06-02 14:31 UTCGHSA enrichment
2026-06-02 03:22 UTCEG score recompute
2026-06-02 03:22 UTCVendor advisory
2026-06-02 03:22 UTCGHSA enrichment
2026-06-01 16:13 UTCEG score recompute
2026-06-01 16:13 UTCVendor advisory
2026-06-01 16:13 UTCGHSA enrichment
2026-06-01 13:52 UTCepss_batch
2026-06-01 05:04 UTCEG score recompute
2026-06-01 05:04 UTCVendor advisory
2026-06-01 05:04 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-8954?

CVE-2026-8954 is a high vulnerability published on May 19, 2026. Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

When was CVE-2026-8954 disclosed?

CVE-2026-8954 was first published in the National Vulnerability Database on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-8954 actively exploited?

CVE-2026-8954 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8954?

CVE-2026-8954 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-8954?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8954, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-8954

Published

Last Modified

Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

Security Vulnerabilities fixed in Firefox 151 — Mozilla

Access Denied

Vendor Advisories for CVE-2026-8954(6)

Patch Availability(6)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-8954?

Same vendor

Same CWE

CVE-2026-8954

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

Security Vulnerabilities fixed in Firefox 151 — Mozilla

Access Denied

📣 Vendor Advisories for CVE-2026-8954(6)

Patch Availability(6)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-8954?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

Advisory Details (5)

Vendor Advisories for CVE-2026-8954(6)

Frequently asked(5)

Related CVEs(same vendor + same CWE)