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    CVE-2026-111145

    ytnef through 2.1.2 contains a heap out-of-bounds read vulnerability in DecompressRTF() in lib/ytnef.c that never validates uncompressedSize for uncompressed RTF streams. Attackers can supply a crafted winmail.dat TNEF attachment with a malicious PT_BINARY MAPI property to crash ytnefprint or libytnef callers and leak adjacent heap memory.

    Published:Oct 15, 2026
    Last Modified:Oct 21, 2026
    EPS:Oct 15, 2026
    EPSS Score:0.00129
    CVSS Score:6.1

    Affected Products

    Vendor
    Ytnef Project
    Product
    Ytnef

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-111146 (CVSS 6.9) — ytnef through 2.1.2 contains a heap out-of-bounds read vulnerability in MAPIPrint() that allows attackers to r…
    CVE-2021-3404 (CVSS 7.8) — In ytnef 1.9.3, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and…
    CVE-2021-3403 (CVSS 7.8) — In ytnef 1.9.3, the TNEFSubjectHandler function in lib/ytnef.c allows remote attackers to cause a denial-of-se…
    CVE-2017-12144 (CVSS 5.5) — In ytnef 1.9.2, an allocation failure was found in the function TNEFFillMapi in ytnef.c, which allows attacker…
    CVE-2017-12141 (CVSS 5.5) — In ytnef 1.9.2, a heap-based buffer overflow vulnerability was found in the function TNEFFillMapi in ytnef.c, …
    CVE-2017-12142 (CVSS 5.5) — In ytnef 1.9.2, an invalid memory read vulnerability was found in the function SwapDWord in ytnef.c, which all…
    CVE-2017-9473 (CVSS 5.5) — In ytnef 1.9.2, the TNEFFillMapi function in lib/ytnef.c allows remote attackers to cause a denial of service …
    CVE-2017-9472 (CVSS 5.5) — In ytnef 1.9.2, the SwapDWord function in lib/ytnef.c allows remote attackers to cause a denial of service (he…
    CVE-2017-9471 (CVSS 5.5) — In ytnef 1.9.2, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial of service (hea…
    CVE-2017-9474 (CVSS 5.5) — In ytnef 1.9.2, the DecompressRTF function in lib/ytnef.c allows remote attackers to cause a denial of service…

    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