Security readout for executives and security teams
Plain-English summary
CVE-2018-11546 is a memory read bug in md4c 0.2.5, a Markdown parser. If an affected application parses attacker-controlled Markdown, the bug could cause out-of-bounds memory reads, likely leading to crashes or information exposure depending on context. The source bundle does not provide CVSS, CWE, confirmed exploitation, or a named fix.
Executive priority
Treat this as an inventory-driven remediation item, not an emergency based on current evidence. Prioritize systems that accept public or customer-supplied Markdown because source data lacks severity scoring and confirmed exploitation.
Technical view
md4c 0.2.5 has a heap-based buffer over-read caused by an off-by-one error in md_is_named_entity_contents. The available sources identify the affected version and function, but do not include exploitability detail, impact scoring, patch version, or downstream product mapping.
Likely exposure
Exposure is most likely in applications or services that embed md4c 0.2.5 and parse untrusted Markdown content, especially content containing HTML-like named entities. The provided affected-product metadata is incomplete, so dependency inventory is required.
Exploitation context
The CVE is not listed as KEV in the supplied bundle, and no cited source confirms active exploitation. Practical risk depends on whether remote or low-trust users can submit Markdown that reaches md4c 0.2.5.
Researcher notes
Evidence is sparse. The CVE description and GitHub issue reference identify an off-by-one in named entity handling causing heap over-read, but the bundle lacks CVSS, CWE, commit details, exploit status, and authoritative remediation guidance.
Mitigation direction
- Inventory applications and libraries for md4c 0.2.5 usage.
- Check upstream md4c guidance and issue 38 for fixed versions or patches.
- Avoid parsing untrusted Markdown with md4c 0.2.5 until remediated.
- Apply process isolation or crash containment around untrusted Markdown parsing.
- Monitor vendor advisories for downstream packages that bundle md4c.
Validation and detection
- Review SBOMs, lockfiles, and build manifests for md4c 0.2.5.
- Confirm whether user-supplied Markdown reaches md4c parsing paths.
- Check crash reports for md4c parser faults near entity parsing.
- Verify deployed binaries after any upgrade or patch.
- Document any compensating controls for untrusted Markdown processing.
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-2018-11546 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/mity/md4c/issues/38CVE 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.