Security readout for executives and security teams
Plain-English summary
CVE-2026-3845 is a high-severity memory corruption flaw in Firefox for Android’s audio/video playback code. A user likely must open or interact with malicious web content. Mozilla fixed it in Firefox 148.0.2. Organizations with managed Android devices should prioritize confirming Firefox is updated.
Executive priority
Treat as a priority mobile browser update. The impact rating is high, but exploitation requires user interaction and no active exploitation is cited. Drive rapid patch compliance across managed Android fleets.
Technical view
The issue is a heap buffer overflow in the Audio/Video: Playback component of Firefox for Android, classified as CWE-122. CVSS 3.1 is 8.8: network-reachable, low complexity, no privileges required, user interaction required, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most relevant to Android devices running Firefox before the Mozilla fix. The source bundle states the vulnerability was fixed in Firefox 148.0.2. Confirm exact affected version ranges from Mozilla’s advisory and device inventory.
Exploitation context
No active exploitation is stated in the provided sources, and the CVE is not marked KEV. The CVSS vector indicates exploitation would require user interaction, such as encountering malicious media or web content, but sources do not provide exploit details.
Researcher notes
Public details are limited in the provided bundle. The affected-version field appears inconsistent because it lists 148.0.2 while the description says 148.0.2 fixes the flaw. Rely on Mozilla advisory details for version scoping.
Mitigation direction
- Update Firefox for Android to version 148.0.2 or later.
- Prioritize managed Android devices with Firefox installed.
- Check Mozilla advisory MFSA 2026-19 for any updated vendor guidance.
- Use mobile device management to verify browser update compliance.
Validation and detection
- Inventory Android devices with Firefox installed.
- Confirm installed Firefox version is 148.0.2 or later.
- Review Mozilla advisory MFSA 2026-19 for affected-version clarification.
- Monitor CVE and Mozilla Bugzilla pages for updates.
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-122: 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-2026-3845 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.
CVSS vector scores
1 official scoreWe 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:H2.85.9Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2020174CVE reference
- https://www.mozilla.org/security/advisories/mfsa2026-19/CVE reference
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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.