Security readout for executives and security teams
Plain-English summary
CVE-2021-26198 concerns JerryScript 2.4.0, a lightweight JavaScript engine. The public record only identifies a crash-type issue in BigInt reference handling. Business urgency depends on whether your products embed this engine and process untrusted JavaScript.
Executive priority
Prioritize asset discovery over emergency response. Escalate only if JerryScript 2.4.0 is embedded in internet-facing or safety-relevant products that process untrusted scripts.
Technical view
The CVE description reports a SEVG, likely intended as SEGV, in ecma_deref_bigint within ecma-helpers.c for JerryScript 2.4.0. No CVSS score, CWE, fixed version, or exploit evidence is provided in the supplied sources.
Likely exposure
Exposure is most likely in firmware, appliances, IoT software, or applications that embed JerryScript 2.4.0. The bundle does not identify broader affected versions or package CPEs.
Exploitation context
The supplied sources do not show active exploitation, CISA KEV listing, exploit availability, or attack prerequisites. Treat this as an unscored embedded-runtime defect until vendor guidance clarifies impact.
Researcher notes
The record is sparse: affected product fields are n/a, severity is unknown, and only a JerryScript issue is referenced. Avoid assuming memory corruption impact beyond the stated crash unless confirmed by project details.
Mitigation direction
- Inventory products and builds for JerryScript 2.4.0.
- Review the GitHub issue and JerryScript advisories for fixed-version guidance.
- Limit untrusted JavaScript execution where JerryScript is embedded.
- Ask vendors whether their firmware or SDKs include affected JerryScript code.
- Monitor CVE and project updates for corrected affected-version data.
Validation and detection
- Check SBOMs and source manifests for JerryScript 2.4.0.
- Confirm whether ecma-helpers.c and ecma_deref_bigint exist in deployed code.
- Map where embedded JerryScript processes user-controlled JavaScript.
- Review vendor release notes for patches referencing CVE-2021-26198.
- Document systems where JerryScript version cannot be confirmed.
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.
CVE-2021-26198 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/jerryscript-project/jerryscript/issues/4402CVE reference · x_refsource_CONFIRM
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.