Security readout for executives and security teams
Plain-English summary
CVE-2018-11468 is a denial-of-service flaw in DISCOUNT 2.2.3a, a Markdown processing library/tool. A crafted file can trigger a heap-based buffer over-read during line trimming, potentially crashing software that processes untrusted Markdown.
Executive priority
Treat as a targeted availability risk, not a confirmed breach indicator. Prioritize systems that convert user-controlled Markdown in web, documentation, ticketing, or content pipelines.
Technical view
The issue is in __mkd_trim_line in mkdio.c within libmarkdown.a in DISCOUNT 2.2.3a. The CVE describes a heap-based buffer over-read reachable through a crafted file, demonstrated with mkd2html. Debian published security updates, but the bundle does not include exact fixed version details.
Likely exposure
Exposure is most likely where DISCOUNT, libmarkdown.a, or mkd2html processes attacker-supplied Markdown files or uploaded content. Systems using Debian packages may have received distro security updates.
Exploitation context
The provided sources describe a crafted-file denial of service. The bundle does not show CISA KEV listing or any cited evidence of active exploitation in the wild.
Researcher notes
Evidence is narrow but consistent: CVE text identifies the vulnerable function, affected 2.2.3a version, memory-safety class, and mkd2html demonstration. Fixed versions and broader affected ranges are not included in the supplied bundle.
Mitigation direction
- Apply the relevant DISCOUNT or Debian security update for affected systems.
- Inventory uses of DISCOUNT, libmarkdown.a, and mkd2html in production workflows.
- Avoid processing untrusted Markdown with affected versions until updated.
- Isolate Markdown conversion jobs to limit service impact from parser crashes.
Validation and detection
- Check installed DISCOUNT package versions against Debian DSA-4293 and DLA-1499-1.
- Review SBOMs and build manifests for bundled libmarkdown.a copies.
- Identify public upload or conversion paths that accept Markdown files.
- Confirm vulnerability scanner results reflect the updated package or removed dependency.
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-2018-11468 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://github.com/Orc/discount/issues/189CVE reference · x_refsource_MISC
- [debian-lts-announce] 20180908 [SECURITY] [DLA 1499-1] discount security updateCVE reference · mailing-list, x_refsource_MLIST
- DSA-4293CVE reference · vendor-advisory, x_refsource_DEBIAN
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.