Tnef: use-after-free and double-free in get_body_files() via multi-value body extraction
Priority LOW 29CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport Neutral Encapsulation Format (TNEF) file containing multiple message bodies. During extraction, improper memory management triggers a use-after-free and double-free condition, causing the application to crash and resulting in a Denial of Service (DoS).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00279 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
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 |
|---|---|---|---|---|---|
| — | tnef | up to 1.4.18 | — | No fix listed | CNA |
- tnef Vendor— Affected up to 1.4.18 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:* | up to 1.4.18 | Vulnerable | Tnef Project |
- cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:* Versions up to 1.4.18 Vulnerable ·Tnef Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-103679
- 2026-10-03 Alias added: GHSA-hh3v-7rq2-8fq9
References
More Tnef Project Tnef vulnerabilities
- TI-2017-06404 An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. CVSS 3.0CRITICAL 9.8
- TI-2017-04142 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
- TI-2017-04141 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
- TI-2017-04140 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
- TI-2017-04139 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
- TI-2026-65748 Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value CVSS 3.1HIGH 8.1
Sources
- CVE-2026-103679 · CVE Program
- CVE-2026-103679 · NVD
- FIRST EPSS
- GHSA-hh3v-7rq2-8fq9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-103679 · Red Hat security data · CC BY 4.0
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