What’s Vulnerable › Vulnerabilities

CVE-2026-103678: Tnef: heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed rtf mapi value

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-01 · updated 2026-10-05
• Weakness: CWE-125

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.

Affected products

• Tnef Project Tnef: through 1.4.18

References

• https://access.redhat.com/security/cve/CVE-2026-103678
• https://bugzilla.redhat.com/show_bug.cgi?id=2544476
• https://github.com/verdammelt/tnef

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