Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2795
“—” beside the score: it is equal to NVD's CVSS score.
Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-02-24. NVD baseline CVSS 9.8; sources differ by 0.0.
- High severity, but no confirmed exploitation yet
The CVE record names the fixed release — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8CRITICALmedium confidence
- EG Risk
- 44EG Risk 44/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity98% × 45%Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.5% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: The CVE record names the fixed release. Apply it within your standard update timelines. - EPSS PROB
- 0.5%
- EPSS %ILE
- 44th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
The CVE record names the fixed release. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
February 24, 2026
Last Modified
July 15, 2026
Advisory Details (6)
Auto-updated Oct 18, 2026Affected: Red Hat Enterprise Linux 10",
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2795.json2442305 – (CVE-2026-2795) CVE-2026-2795 firefox: Use-after-free in the JavaScript: GC component
https://bugzilla.redhat.com/show_bug.cgi?id=2442305CVE-2026-2795 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-2795Security Vulnerabilities fixed in Thunderbird 148 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2026-16/Security Vulnerabilities fixed in Firefox 148 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2026-13/2010940 - (CVE-2026-2795) Assertion failure: kind == JS::TracerKind::Tenuring || kind == JS::TracerKind::MinorSweeping || kind == JS::TracerKind::Moving || kind == JS::TracerKind::HeapCheck, at js/src/gc/Marking.cpp:144
https://bugzilla.mozilla.org/show_bug.cgi?id=2010940Vendor Advisories for CVE-2026-2795(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 20× in last 7d / 52× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 95 of 261 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 166 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-23 02:20 UTCEG score recompute
- 2026-10-23 02:20 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-22 01:18 UTCEG score recompute
- 2026-10-22 01:18 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-21 00:16 UTCEG score recompute
- 2026-10-21 00:16 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-19 23:11 UTCEG score recompute
- 2026-10-19 23:11 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-18 22:07 UTCEG score recompute
- 2026-10-18 22:07 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-18 03:50 UTCEG score recompute
- 2026-10-17 20:53 UTCEG score recompute
- 2026-10-17 20:53 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-16 19:50 UTCEG score recompute
- 2026-10-16 19:50 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-15 17:09 UTCEG score recompute
- 2026-10-15 17:09 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
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- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-14 11:07 UTCEG score recompute
- 2026-10-14 11:07 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-13 09:51 UTCEG score recompute
- 2026-10-13 09:51 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-12 16:17 UTCEG score recompute
- 2026-10-12 08:48 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-11 19:59 UTCEG score recompute
- 2026-10-11 17:12 UTCEG score recompute
- 2026-10-11 14:43 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-15 01:41 UTCEG score recompute
- 2026-08-15 01:41 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-14 21:28 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 13:20 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 09:07 UTCEG score recompute
- 2026-08-14 09:07 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-13 01:06 UTCEG score recompute
- 2026-08-13 01:06 UTCGHSA enrichmentGHSA-8g7m-g6r7-rqcp · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-08-12 00:53 UTCEG score recompute
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Frequently asked(5)
What is CVE-2026-2795?
When was the CVE record for CVE-2026-2795 published?
Is CVE-2026-2795 actively exploited?
What is the CVSS score of CVE-2026-2795?
How do I remediate CVE-2026-2795?
Dependency Blast Radius
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