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CVE-2026-103679

Tnef Project Tnef: use-after-free can lead to denial of service

Risk score
43/100
CVSS
6.5 v3.1
Exploit chance (30 days)
0.3%
Published
1 Oct 2026

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What to know

What it is
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…
Affected
Tnef Project Tnef
Fix
Apply the vendor's security update; see the linked advisory.
Exploitation
No known exploitation

Story map

Story map: Tnef Project TnefTHE FLAWSTHE FIXCVE-2026-103679Use-after-free can lead todenial of serviceCVSS 6.5 · EPSS 0%CVE-2026-103678Out-of-bounds read can lead todenial of serviceCVSS 8.1 · EPSS 0%CVE-2026-103680Out-of-bounds write can leadto remote code executionCVSS 6.5 · EPSS 0%FixApply the vendor's securityupdate; see the linked advisory.Who is exposedTnef Project TnefYELLOW · PLAN IT INTnef ProjectTnefA flaw was found in tnef. Anattacker can exploit thisvulnerability by providing aspecially crafted file containinguncompressed Rich Text Format(RTF) data. Because theapplication fails to properly…Where it standsNo known exploitationCONNECTS TOSame weaknessUse-after-free (CWE-416)399 other warnings in 30 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Tnef Project Tnef: Yellow, plan it in. A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory …

The flaws

  • CVE-2026-103679: Use-after-free can lead to denial of service (CVSS 6.5 · EPSS 0%)
  • CVE-2026-103678: Out-of-bounds read can lead to denial of service (CVSS 8.1 · EPSS 0%)
  • CVE-2026-103680: Out-of-bounds write can lead to remote code execution (CVSS 6.5 · EPSS 0%)

The fix

Fix: Apply the vendor's security update; see the linked advisory.

Who is exposed: Tnef Project Tnef

Where it stands

  • No known exploitation

Connects to

Why it is Yellow

  • CVSS 6.5 medium

References

Original description

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).

Last activity 1 Oct 2026. Patch Forecast updates every hour.