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    CVE-2026-45185

    Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.

    Published:May 12, 2026
    Last Modified:Jun 18, 2026
    EPS:May 12, 2026
    EPSS Score:0.01225
    CVSS Score:9.8

    Affected Products

    Vendor
    Exim
    Product
    Exim

    Exploits

    https://github.com/0init/CVE-2026-45185https://github.com/liamromanis101/Dead.Letter-CVE-2026-45185https://github.com/materaj2/cve-2026-45185-detection-scripthttps://github.com/MJ-bin/POC_CVE-2026-45185

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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