Security readout for executives and security teams
Plain-English summary
CVE-2026-2795 is a high-severity Mozilla memory-safety bug in JavaScript garbage collection. Affected Firefox or Thunderbird users could face serious compromise if they interact with malicious content. Mozilla says the issue was fixed in Firefox 148 and Thunderbird 148.
Executive priority
Prioritize this in the normal urgent browser and mail-client patch cycle. It is high impact, remotely reachable with user interaction, and affects common endpoint software, but the provided evidence does not support claiming active exploitation.
Technical view
The flaw is a CWE-416 use-after-free in the JavaScript GC component. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges required, and user interaction required. The source bundle reports high confidentiality, integrity, and availability impact.
Likely exposure
Organizations with Firefox or Thunderbird installations that have not reached the fixed 148 releases should treat those endpoints as potentially exposed. Exposure is most relevant on user workstations and managed desktop fleets where browser or mail-client updates lag.
Exploitation context
The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation requires user interaction, but no exploit details, public exploit status, or weaponized technique is provided in the sources.
Researcher notes
Focus validation on version state and advisory tracking, not exploit reproduction. The available evidence identifies a JavaScript GC use-after-free fixed in Mozilla 148 releases, but does not provide root-cause detail, reliable indicators, or exploitation telemetry.
Mitigation direction
- Update Firefox to the Mozilla-fixed 148 release or later.
- Update Thunderbird to the Mozilla-fixed 148 release or later.
- Check Mozilla advisories for any product-specific deployment guidance.
- Prioritize managed endpoints with delayed browser or mail-client patching.
- Use existing enterprise controls to verify update compliance.
Validation and detection
- Inventory Firefox versions across managed endpoints.
- Inventory Thunderbird versions across managed endpoints.
- Confirm deployed builds are at least the fixed 148 releases.
- Review vulnerability scanner findings against CVE-2026-2795.
- Check Mozilla and Red Hat advisories for updated remediation notes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-2795 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-02-24T14:03:21.090Z: Reported to Red Hat.
- 2026-02-24T13:33:26.111Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2010940CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2026-13/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2026-16/CVE reference, mozilla
- https://access.redhat.com/security/cve/CVE-2026-2795CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2442305CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2795.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.