Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-103678

CVE-2026-103678HIGH

Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  N  H    8.1   .0024   13.7     —

AFFECTED
  Product  Versions     Fixed
  tnef     unspecified  —

TIMELINE
  Oct 1   Reserved by fedora
  Oct 1   Published (CNA: fedora)
  Oct 5   RESCORED — CVE-2026-103678 (tnef). CVSS 5.4 → 8.1 (NVD).

CWE-125 · CNA: fedora · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

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 occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 1, 2026	Reserved	Reserved by fedora
October 1, 2026	Published	Published (CNA: fedora)
October 5, 2026	RESCORED	RESCORED — CVE-2026-103678 (tnef). CVSS 5.4 → 8.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
—	tnef	—	—	—

Weaknesses

CWE-125

References (3)

https://access.redhat.com/security/cve/CVE-2026-103678 [Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2544476 [Issue Tracking, Third Party Advisory]
https://github.com/verdammelt/tnef [Product]

Authoritative record: CVE-2026-103678 at cve.org

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-103678 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.