md4c 0.2.5 has a heap-based buffer overflow in md_merge_lines because md_is_link_label…
Priority MEDIUM 45CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
md4c 0.2.5 has a heap-based buffer overflow in md_merge_lines because md_is_link_label mishandles the case of a link label composed solely of backslash escapes.
Why it matters now
EPSS 0.01534 74th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:md4c_project:md4c:0.2.5:*:*:*:*:*:*:* | 0.2.5 | Vulnerable | Md4c Project |
- cpe:2.3:a:md4c_project:md4c:0.2.5:*:*:*:*:*:*:* Versions 0.2.5 Vulnerable ·Md4c Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-11545
- 2026-10-03 Alias added: GHSA-78q4-2c8r-5ghp
References
Advisory 1
More Md4c Project Md4c vulnerabilities
- TI-2018-08257 md_is_link_reference_definition_helper in md4c 0.2.5 has a heap-based buffer over-read… CVSS 3.0CRITICAL 9.8
- TI-2018-08256 md4c 0.2.5 has a heap-based buffer over-read because md_is_named_entity_contents has an off-by-one error. CVSS 3.0CRITICAL 9.8
- TI-2018-08248 md4c before 0.2.5 has a heap-based buffer overflow because md_split_simple_pairing_mark mishandles splits. CVSS 3.0CRITICAL 9.8
- TI-2018-08688 md_build_attribute in md4c.c in md4c 0.2.6 allows remote attackers to cause a denial of… CVSS 3.0HIGH 7.8
- TI-2020-15985 md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of… CVSS 3.1HIGH 7.5
- TI-2021-10627 md_analyze_line in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2018-11545 · CVE Program
- CVE-2018-11545 · NVD
- FIRST EPSS
- GHSA-78q4-2c8r-5ghp · GitHub Advisory Database · CC BY 4.0
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