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    CVE-2026-92238

    A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

    Published:Sep 15, 2026
    Last Modified:Sep 24, 2026
    EPS:Sep 15, 2026
    EPSS Score:0.00607
    CVSS Score:9.8

    Affected Products

    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

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    CVE-2026-118178 (CVSS 5.7) — A remote RSS feed could use the itunes:new-feed-url or newLocation element to permanently change its stored su…
    CVE-2026-118177 (CVSS 9.1) — When looking for calendars in a directory on a server, during account setup or when adding a new network calen…
    CVE-2026-118176 (CVSS 8.1) — Thunderbird's check that prevents mailbox: URLs from accessing files on remote Windows network shares could be…
    CVE-2026-118175 (CVSS 7.5) — When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a di…
    CVE-2026-118174 (CVSS 6.5) — When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attach…
    CVE-2026-117976 (CVSS 8.1) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 159, Firefox ES…
    CVE-2026-117964 (CVSS 8.8) — Use-after-free in the Panning and Zooming component. This vulnerability was fixed in Firefox 159, Firefox ESR …
    CVE-2026-117929 (CVSS 8.8) — Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115…

    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