Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
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This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 22% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
January 7, 2021
November 21, 2024
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | firefox-mozsymbols (84.0+build3-0ubuntu0.18.04.1) @ bionic | 2026-05-26 | ubuntu |
| ubuntu | xul-ext-lightning (1:78.6.1+build1-0ubuntu0.20.10.1) @ groovy | 2026-05-26 | ubuntu |
| redhat | thunderbird-0:78.6.0-1.el8_0 | 2020-12-21 | redhat |
| redhat | thunderbird-0:78.6.0-1.el8_1 | 2020-12-21 | redhat |
| redhat | thunderbird-0:78.6.0-1.el8_2 | 2020-12-17 | redhat |
| redhat | thunderbird-0:78.6.0-1.el7_9 | 2020-12-17 | redhat |
| redhat | thunderbird-0:78.6.0-1.el8_3 | 2020-12-17 | redhat |
| redhat | firefox-0:78.6.0-1.el8_2 | 2020-12-16 | redhat |
| redhat | firefox-0:78.6.0-1.el7_9 | 2020-12-16 | redhat |
| redhat | firefox-0:78.6.0-1.el8_3 | 2020-12-16 | redhat |
| redhat | firefox-0:78.6.0-1.el8_1 | 2020-12-16 | redhat |
| redhat | firefox-0:78.6.0-1.el8_0 | 2020-12-16 | 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.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
RHSA-2020:5561 — Important
RHSA-2020:5562 — Important
RHSA-2020:5563 — Important
RHSA-2020:5564 — Important
RHSA-2020:5565 — Important
RHSA-2020:5618 — Important
RHSA-2020:5622 — Important
RHSA-2020:5624 — Important
RHSA-2020:5644 — Important
RHSA-2020:5645 — Important
Firefox vulnerabilities
Thunderbird vulnerabilities
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-26971
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redhat
CWE-787