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CVE-2026-103678

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

5.4 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.24%Unchanged since Oct 2, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.4

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

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.

Record
CVE-2026-103678
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
EUVDEUVD-2026-90771 5.4

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.

Record
EUVD-2026-90771
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-8r4j-263j-fh85 5.4

A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially...

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.

Record
GHSA-8r4j-263j-fh85
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
NVD 5.4

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.

Record
CVE-2026-103678
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSV 5.4

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

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.

Record
CVE-2026-103678
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
OSVDEBIAN-CVE-2026-103678 8.1

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.

Record
DEBIAN-CVE-2026-103678
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-103678 5.4

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.

Record
UBUNTU-CVE-2026-103678
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tnef
Debian:12
All versions, plus listed versions
1.4.18-31.4.18-41.4.18-51.4.18-6
None known
tnef
Debian:13
All versions, plus listed versions
1.4.18-41.4.18-51.4.18-6
None known
tnef
Debian:14
All versions, plus listed versions
1.4.18-41.4.18-51.4.18-6
None known
tnef
Ubuntu:16.04:LTS
All versions, plus listed versions
1.4.9-11.4.9-1+deb8u2build0.16.04.11.4.9-1+deb8u3build0.16.04.11.4.9-1+deb8u4build0.16.04.1
None known
tnef
Ubuntu:18.04:LTS
All versions, plus listed versions
1.4.12-1.2
None known
tnef
Ubuntu:20.04:LTS
All versions, plus listed versions
1.4.12-1.21.4.18-1
None known
tnef
Ubuntu:22.04:LTS
All versions, plus listed versions
1.4.18-3
None known
tnef
Ubuntu:24.04:LTS
All versions, plus listed versions
1.4.18-3
None known
tnef
Ubuntu:26.10
All versions, plus listed versions
1.4.18-5build11.4.18-6
None known
tnef
Ubuntu:26.04:LTS
All versions, plus listed versions
1.4.18-51.4.18-5build1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-103678 is a medium vulnerability (CVSS 5.4) in Tnef Project Tnef, published October 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. No source names a fixed version.

References

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