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    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).

    Published:Oct 1, 2026
    Last Modified:Oct 5, 2026
    EPS:Oct 1, 2026
    EPSS Score:0.00296
    CVSS Score:6.5

    Affected Products

    Vendor
    Tnef Project
    Product
    Tnef
    Vendor
    Verdammelt
    Product
    Tnef

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-103680 (CVSS 3.1) — A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when gener…
    CVE-2026-103678 (CVSS 5.4) — A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file con…
    CVE-2019-18849 (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-mai…
    CVE-2017-8911 (CVSS 9.8) — An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to …
    CVE-2017-6309 (CVSS 7.8) — An issue was discovered in tnef before 1.4.13. Two type confusions have been identified in the parse_file() fu…
    CVE-2017-6308 (CVSS 7.8) — An issue was discovered in tnef before 1.4.13. Several Integer Overflows, which can lead to Heap Overflows, ha…
    CVE-2017-6310 (CVSS 7.8) — An issue was discovered in tnef before 1.4.13. Four type confusions have been identified in the file_add_mapi_…
    CVE-2017-6307 (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_att…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High