Security readout for executives and security teams
Plain-English summary
CVE-2022-31100 affects rulex before 0.4.3. A user-supplied rulex expression can make the parser panic, which may take down the handling thread and cause denial of service. The issue matters mainly for services that let untrusted users submit rulex expressions.
Executive priority
Treat as a targeted availability risk, not a broad compromise issue. Prioritize remediation for internet-facing or customer-facing services that parse user-provided rulex expressions.
Technical view
rulex improperly slices multi-byte UTF-8 while parsing certain expression content, causing a Rust panic. The published impact is availability only, mapped to CWE-617 and CVSS 6.5. The vendor fixed the crash in rulex 0.4.3 and names panic-catching as the only known workaround.
Likely exposure
Exposure is limited to applications using rulex versions before 0.4.3 and parsing expressions supplied by untrusted or low-privileged users. Internal-only uses with trusted expressions are lower risk.
Exploitation context
The source bundle does not cite active exploitation, and the CVE is not marked KEV. The vulnerability is low-complexity and network-relevant when a service exposes rulex parsing to authenticated users.
Researcher notes
The evidence supports denial of service through reachable assertion/panic during parsing. No confidentiality or integrity impact is stated. Do not expand affected products beyond rulex-rs rulex before 0.4.3 without separate evidence.
Mitigation direction
- Upgrade rulex to version 0.4.3 or later.
- Add panic-catching around rulex parsing where immediate upgrade is not possible.
- Temporarily restrict untrusted rulex expression parsing until patched, if feasible.
- Review the GitHub advisory for any newer vendor guidance.
Validation and detection
- Check manifests and lockfiles for rulex versions below 0.4.3.
- Identify whether untrusted users can submit rulex expressions.
- Confirm parser panics cannot make the service unavailable.
- Verify the fixed rulex version is deployed in production artifacts.
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-617: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-31100 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
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/rulex-rs/rulex/security/advisories/GHSA-8v9w-p43c-r885CVE reference · x_refsource_CONFIRM
- https://github.com/rulex-rs/rulex/commit/fac6d58b25c6f9f8c0a6cdc4dec75b37b219f1d6CVE 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.
Reachable Assertion
Reachable Assertion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.