How severe is CVE-2026-103679?

CVE-2026-103679 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-103679 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-103679?

CVE-2026-103679 affects Tnef Project Tnef. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-103679?

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

When was CVE-2026-103679 published?

CVE-2026-103679 was published on 2026-10-01 and last updated on 2026-10-05.

CVE-2026-103679

CVE-2026-103679 is a medium-severity vulnerability in Tnef Project Tnef with a CVSS 3.x base score of 6.5. 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-416.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Tnef Project Tnef
Published: 2026-10-01
Last modified: 2026-10-05

Description

A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport Neutral Encapsulation Format (TNEF) file containing multiple message bodies. During extraction, improper memory management triggers a use-after-free and double-free condition, causing the application to crash and resulting in a Denial of Service (DoS).

Frequently asked questions

What is CVE-2026-103679?: A flaw was found in tnef. A remote attacker could exploit this vulnerability by providing a specially crafted Transport Neutral Encapsulation Format (TNEF) file containing multiple message bodies. During extraction, improper memory management triggers a use-after-free and double-free condition, causing the application to crash and resulting in a Denial of Service (DoS).
How severe is CVE-2026-103679?: CVE-2026-103679 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-103679 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-103679?: CVE-2026-103679 affects Tnef Project Tnef. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-103679?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-103679 published?: CVE-2026-103679 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-2019-18849 — Medium (CVSS 5.5): In tnef before 1.4.18, an attacker may be able to write to the victim's .ssh/authorized_keys file via an e-mail message…

All CVEs affecting Tnef Project Tnef →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-63795 — Critical (CVSS 10.0): In the Linux kernel, the following vulnerability has been resolved: 9p: avoid putting oldfid in p9_client_walk() error…
CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…

Browse all CWE-416 (Use After Free) vulnerabilities →