How severe is CVE-2026-103678?

CVE-2026-103678 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-103678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-103678?

CVE-2026-103678 affects Tnef Project Tnef. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-103678?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-103678 published?

CVE-2026-103678 was published on 2026-10-01 and last updated on 2026-10-05.

CVE-2026-103678

CVE-2026-103678 is a medium-severity vulnerability in Tnef Project Tnef with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Tnef Project Tnef
Published: 2026-10-01
Last modified: 2026-10-05

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.

Frequently asked questions

What is CVE-2026-103678?: 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.
How severe is CVE-2026-103678?: CVE-2026-103678 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-103678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-103678?: CVE-2026-103678 affects Tnef Project Tnef. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-103678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-103678 published?: CVE-2026-103678 was published on 2026-10-01 and last updated on 2026-10-05.

References

Affected products (1)

cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:*

More vulnerabilities in Tnef Project Tnef

CVE-2017-8911 — Critical (CVSS 9.8): An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid…
CVE-2017-6310 — High (CVSS 7.8): An issue was discovered in tnef before 1.4.13. Four type confusions have been identified in the file_add_mapi_attrs()…
CVE-2017-6309 — High (CVSS 7.8): An issue was discovered in tnef before 1.4.13. Two type confusions have been identified in the parse_file() function.…
CVE-2017-6308 — High (CVSS 7.8): An issue was discovered in tnef before 1.4.13. Several Integer Overflows, which can lead to Heap Overflows, have been…
CVE-2017-6307 — High (CVSS 7.8): An issue was discovered in tnef before 1.4.13. Two OOB Writes have been identified in src/mapi_attr.c:mapi_attr_read().…
CVE-2026-103679 — Medium (CVSS 6.5): A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport…

All CVEs affecting Tnef Project Tnef →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →