An Out of Bounds flaw was discovered in htmodoc 1.9.12 in function parse_tree() in…
Priority HIGH 69CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An Out of Bounds flaw was discovered in htmodoc 1.9.12 in function parse_tree() in toc.cxx, this possibly leads to memory layout information leaking in the data. This might be used in a chain of vulnerability in order to reach code execution.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00336 27th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
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:htmldoc_project:htmldoc:1.9.12:*:*:*:*:*:*:* | 1.9.12 | Vulnerable | Htmldoc Project |
- cpe:2.3:a:htmldoc_project:htmldoc:1.9.12:*:*:*:*:*:*:* Versions 1.9.12 Vulnerable ·Htmldoc Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34121
- 2026-10-03 Alias added: GHSA-vvmp-35v7-f6q6
References
More Htmldoc Project Htmldoc vulnerabilities
- TI-2024-30988 HTMLDOC v1.9.18 contains a buffer overflow in parse_pre function,ps-pdf.cxx:5681. CVSS 3.1CRITICAL 9.8
- TI-2024-30543 HTMLDOC before 1.9.19 has an out-of-bounds write in parse_paragraph in ps-pdf.cxx because… CVSS 3.1CRITICAL 9.8
- TI-2021-13277 A flaw was discovered in htmodoc 1.9.12 in function parse_paragraph in ps-pdf.cxx ,this… CVSS 3.1HIGH 7.8
- TI-2022-00080 Memory corruption in michaelrsweet htmldoc CVSS 3.1HIGH 7.5
- TI-2021-05943 Heap-based buffer overflow in htmldoc CVSS 3.1CRITICAL 9.8
- TI-2021-05939 Double free in htmldoc CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-34121 · CVE Program
- CVE-2021-34121 · NVD
- FIRST EPSS
- GHSA-vvmp-35v7-f6q6 · GitHub Advisory Database · CC BY 4.0
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