Security readout for executives and security teams
Plain-English summary
CVE-2017-11556 is a denial-of-service issue in LibSass 3.4.5. A specially crafted input can cause excessive stack use in the parser and may crash or stall processing. Business risk depends on whether any service or build pipeline parses Sass input from untrusted sources.
Executive priority
Treat this as a targeted availability risk, not a broad compromise signal. Prioritize remediation where LibSass processes untrusted input in customer-facing or shared infrastructure.
Technical view
The issue is reported in Parser::advanceToNextToken in parser.cpp in LibSass 3.4.5. The source description characterizes it as stack consumption triggered by crafted input, with remote denial of service possible. The bundle provides no CVSS score, CWE, patch version, or detailed exploit evidence.
Likely exposure
Exposure is most likely in applications, workers, or build systems that use LibSass 3.4.5 and accept Sass or stylesheet input from users, tenants, packages, or other untrusted sources.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires reaching a vulnerable LibSass parser with crafted input. Impact appears limited to availability based on the supplied description.
Researcher notes
Evidence is sparse. The record names LibSass 3.4.5 and one parser function but does not provide CVSS, CWE, affected CPEs, patch metadata, or confirmed exploitation. Validate exposure before escalating severity.
Mitigation direction
- Inventory LibSass usage and confirm whether version 3.4.5 is present.
- Check vendor or distribution guidance for fixed or backported packages.
- Avoid parsing untrusted Sass input with vulnerable LibSass builds.
- Isolate Sass compilation with resource limits and process supervision.
- Monitor parser crashes, worker restarts, and unusual compilation failures.
Validation and detection
- Review SBOMs, lockfiles, containers, and system packages for LibSass 3.4.5.
- Map every path where Sass input reaches LibSass parsing.
- Confirm whether those paths accept user-controlled or third-party content.
- Check Red Hat or upstream tracking for remediation status.
- Verify production workers recover cleanly from parser failures.
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-2017-11556 mapping review
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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://bugzilla.redhat.com/show_bug.cgi?id=1471786CVE 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.