TI-2026-65748 Aliases CVE-2026-103678 GHSA-8r4j-263j-fh85

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

LOW 35CWE-125Published 2026-10-01 · Updated 2026-10-01

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00235 14th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	tnef	up to 1.4.18	—	No fix listed	CNA

tnef Vendor— Affected up to 1.4.18 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tnef_project:tnef::::::::	up to 1.4.18	Vulnerable	Tnef Project

cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:* Versions up to 1.4.18 Vulnerable ·Tnef Project

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-103678
2026-10-03 Alias added: GHSA-8r4j-263j-fh85
2026-10-05 CVSS score added · NVD

References

Advisory 2

Other 1

https://github.com/verdammelt/tnef

TI-2017-06404 An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. CVSS 3.0CRITICAL 9.8
TI-2017-04142 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
TI-2017-04141 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
TI-2017-04140 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
TI-2017-04139 An issue was discovered in tnef before 1.4.13. CVSS 3.0HIGH 7.8
TI-2026-65750 Tnef: heap buffer overflow in find_free_number() via numbered-backup suffix generation CVSS 3.1MEDIUM 6.5

See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences