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).
CVE-2026-103679
MEDIUMPre-NVD 6.56.5—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 6.5 from GitHub Security Advisory published 2026-10-01. A secondary CVSS source baseline 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5MEDIUMhigh confidence
- EG Risk
- 29EG Risk 29/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation0% × 40%Automatability0% × 15%CISA SSVC: Track at every mission impact level.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 20th
- KEV
- Not listed
CISA SSVCTrack at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 1, 2026
Last Modified
October 1, 2026
Advisory Details (3)
Auto-updated Oct 1, 2026Patch available. Sources: redhat.
redhat
2544477 – (CVE-2026-103679) CVE-2026-103679 tnef: Use-after-free and double-free in get_body_files() via multi-value body extraction
https://bugzilla.redhat.com/show_bug.cgi?id=2544477redhat Patch Available
CVE-2026-103679 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-103679Vendor Advisories for CVE-2026-103679(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| tnef | 1.4.18-3, 1.4.18-4, 1.4.18-5, 1.4.18-6 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| tnef | 1.4.18-4, 1.4.18-5, 1.4.18-6 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| tnef | 1.4.18-4, 1.4.18-5, 1.4.18-6 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 15× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-04 23:21 UTCEPSS rescore
- 2026-10-04 14:37 UTCGHSA enrichment
- 2026-10-03 14:52 UTCEG score recompute
- 2026-10-03 14:52 UTCGHSA enrichment
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-02 15:07 UTCGHSA enrichment
- 2026-10-01 15:23 UTCEG score recompute
- 2026-10-01 15:23 UTCGHSA enrichment
- 2026-10-01 15:06 UTCEG score recompute
- 2026-10-01 15:06 UTCGHSA enrichment
- 2026-10-01 13:09 UTCEG score recompute
- 2026-10-01 13:09 UTCGHSA enrichment
- 2026-10-01 12:28 UTCEG score recompute
- 2026-10-01 11:48 UTCEG score recompute
- 2026-10-01 11:45 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-103679?
CVE-2026-103679 is a medium vulnerability published on October 1, 2026. 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,…
When was CVE-2026-103679 disclosed?
CVE-2026-103679 was first published on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103679 actively exploited?
CVE-2026-103679 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103679?
CVE-2026-103679 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103679?
A fix for CVE-2026-103679 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103679 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-103679
Is Your Infrastructure Affected by CVE-2026-103679?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.