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    CVE-2026-67591

    An authenticated attacker could exceed the session flow control incoming window potentially leading to denial of service. This issue affects Apache Qpid ProtonJ2: through 1.1.0. Users are recommended to upgrade to version 1.2.0, which fixes the issue.

    Published:Aug 5, 2026
    Last Modified:Aug 11, 2026
    EPS:Aug 5, 2026
    EPSS Score:0.00421
    CVSS Score:6.5

    Affected Products

    Vendor
    Apache
    Product
    Qpid Proton-j
    Vendor
    Apache
    Product
    Qpid Protonj2

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-67592 (CVSS 7.5) — It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authent…
    CVE-2026-66277 (CVSS 6.5) — It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authent…
    CVE-2026-66276 (CVSS 6.5) — An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usa…
    CVE-2026-66275 (CVSS 6.5) — An authenticated attacker could exceed the session flow control incoming window potentially leading to denial …
    CVE-2026-67590 (CVSS 7.5) — A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to…
    CVE-2026-66274 (CVSS 7.5) — A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to…
    CVE-2026-67589 (CVSS 7.5) — A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to…
    CVE-2026-66273 (CVSS 7.5) — A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to…
    CVE-2026-67588 (CVSS 7.5) — A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leadi…
    CVE-2026-66257 (CVSS 7.5) — A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leadi…

    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