Security readout for executives and security teams
Plain-English summary
This CVE describes a denial-of-service weakness in split-html-to-chars v1.0.5. Crafted invalid HTML can trigger excessive regular-expression processing, potentially tying up an application using the package. The sources do not provide severity, CVSS, confirmed product metadata, patch status, or active exploitation evidence.
Executive priority
Treat this as a targeted availability risk requiring inventory validation, not an emergency based on current evidence. Prioritize internet-facing or high-volume services that process user-supplied HTML and depend on the named version.
Technical view
The reported issue is ReDoS during HTML splitting in split-html-to-chars v1.0.5 when processing crafted invalid HTML. The vulnerability appears input-driven and availability-focused. Public source data is sparse: no CWE, CPE, CVSS vector, exploit confirmation, or remediation version is listed in the supplied bundle.
Likely exposure
Exposure is most likely in applications that include split-html-to-chars v1.0.5 and pass attacker-controlled or untrusted HTML into it. Confirm through dependency inventories, lockfiles, SBOMs, and code paths handling HTML input.
Exploitation context
The source bundle does not show KEV listing or cited active exploitation. The plausible impact is resource exhaustion against services that parse crafted invalid HTML through the vulnerable library, but exploitability and real-world reach are not established by the supplied evidence.
Researcher notes
Evidence is limited to a CVE description and a GitHub reference. No CVSS, CWE, CPE, patch version, proof-of-concept status, or advisory detail is included. Avoid broad product claims until package metadata and reachable application usage are confirmed.
Mitigation direction
- Check upstream package guidance for a fixed release or official workaround.
- Replace or remove split-html-to-chars v1.0.5 where no maintained fix exists.
- Restrict untrusted HTML processing through this dependency.
- Apply input size limits and processing timeouts around HTML parsing flows.
- Monitor services using this library for CPU spikes or request stalls.
Validation and detection
- Search dependency manifests and lockfiles for split-html-to-chars v1.0.5.
- Identify code paths passing external HTML into the library.
- Confirm whether those paths are reachable from public or partner inputs.
- Review upstream repository or package registry for remediation status.
- Test availability controls using safe, non-offensive malformed-input regression cases.
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-2021-40897 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/yetingli/SaveResults/blob/main/js/split-html-to-chars.jsCVE reference · x_refsource_MISC
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.