CVE-2026-103679

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-90772 (ENISA EUVD) · GHSA-hh3v-7rq2-8fq9 (GitHub Security Advisories)Source: ENISA EUVD

6.5EG
EchelonGraph verdictMonitorNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (Fedora Project) lists tnef versions up to and including 1.4.18 as affected. No release containing a fix is confirmed on record.

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).

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 1, 2026

Last Modified

October 5, 2026

Advisory Details (3)

Auto-updated Oct 1, 2026
No fix on record yet. Sources: redhat.
Web page

GitHub - verdammelt/tnef: tnef · GitHub

https://github.com/verdammelt/tnef
Red Hat

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=2544477
Red HatMentions a patch (unverified)

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-2026-103679

Vendor 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)
PackageVulnerable rangeFix by version rangeDependents
tnef1.4.18-3, 1.4.18-4, 1.4.18-5, 1.4.18-6
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tnef1.4.18-4, 1.4.18-5, 1.4.18-6
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tnef1.4.18-4, 1.4.18-5, 1.4.18-6
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 55× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-10-31 12:33 UTCEG score recompute
  5. 2026-10-31 12:33 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  6. 2026-10-31 12:25 UTCOSV refresh
  7. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  12. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  13. 2026-10-25 14:56 UTCEG score recompute
  14. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-23 09:17 UTCEG score recompute
  17. 2026-10-23 09:17 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  18. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-10-18 05:09 UTCEG score recompute
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 43 more
  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-12 16:40 UTCEG score recompute
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-11 20:15 UTCEG score recompute
  7. 2026-10-11 18:28 UTCEG score recompute
  8. 2026-10-11 14:47 UTCEG score recompute
  9. 2026-10-11 14:47 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  10. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-10 15:02 UTCEG score recompute
  13. 2026-10-10 15:02 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  14. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-09 15:17 UTCEG score recompute
  16. 2026-10-09 15:17 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  17. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-08 15:32 UTCEG score recompute
  19. 2026-10-08 15:32 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  20. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-10-07 13:38 UTCEG score recompute
  22. 2026-10-07 13:38 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  23. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-10-06 13:53 UTCEG score recompute
  25. 2026-10-06 13:53 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  26. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-10-05 14:08 UTCEG score recompute
  28. 2026-10-05 14:08 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  29. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-10-04 14:37 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  31. 2026-10-03 14:52 UTCEG score recompute
  32. 2026-10-03 14:52 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  33. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-10-02 15:07 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  35. 2026-10-01 15:23 UTCEG score recompute
  36. 2026-10-01 15:23 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  37. 2026-10-01 15:06 UTCEG score recompute
  38. 2026-10-01 15:06 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  39. 2026-10-01 13:09 UTCEG score recompute
  40. 2026-10-01 13:09 UTCGHSA enrichmentGHSA-hh3v-7rq2-8fq9 · GitHub CVSS 6.5
  41. 2026-10-01 12:28 UTCEG score recompute
  42. 2026-10-01 11:48 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  43. 2026-10-01 11:45 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-103679?
CVE-2026-103679 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-103679 was made public on October 1, 2026: that is the date its CVE record's CNA, Fedora Project, gives for when the vulnerability was made public. The CVE record itself was published on October 1, 2026. EchelonGraph's copy of the record carries a last-modified date of October 5, 2026; the record at its source may have been updated since.
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?
No fix for CVE-2026-103679 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Fedora Project) lists tnef versions up to and including 1.4.18 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-103679 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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