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    2 vulnerabilities by dunglas

    CVE-2026-39972 (GCVE-0-2026-39972)

    Vulnerability from nvd – Published: 2026-04-09 16:42 – Updated: 2026-04-09 18:59
    VLAI
    Title
    Mercure has a Topic Selector Cache Key Collision
    Summary
    Mercure is a protocol for pushing data updates to web browsers and other HTTP clients in a battery-efficient way. Prior to 0.22.0, a cache key collision vulnerability in TopicSelectorStore allows an attacker to poison the match result cache, potentially causing private updates to be delivered to unauthorized subscribers or blocking delivery to authorized ones. The cache key was constructed by concatenating the topic selector and topic with an underscore separator. Because both topic selectors and topics can contain underscores, two distinct pairs can produce the same key. An attacker who can subscribe to the hub or publish updates with crafted topic names can exploit this to bypass authorization checks on private updates. This vulnerability is fixed in 0.22.0.
    Severity
    7.1 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
    Assigner
    References
    Impacted products
    Vendor Product Version
    dunglas mercure Affected: < 0.22.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-39972 (GCVE-0-2026-39972)

    Vulnerability from cvelistv5 – Published: 2026-04-09 16:42 – Updated: 2026-04-09 18:59
    VLAI
    Title
    Mercure has a Topic Selector Cache Key Collision
    Summary
    Mercure is a protocol for pushing data updates to web browsers and other HTTP clients in a battery-efficient way. Prior to 0.22.0, a cache key collision vulnerability in TopicSelectorStore allows an attacker to poison the match result cache, potentially causing private updates to be delivered to unauthorized subscribers or blocking delivery to authorized ones. The cache key was constructed by concatenating the topic selector and topic with an underscore separator. Because both topic selectors and topics can contain underscores, two distinct pairs can produce the same key. An attacker who can subscribe to the hub or publish updates with crafted topic names can exploit this to bypass authorization checks on private updates. This vulnerability is fixed in 0.22.0.
    Severity
    7.1 (High)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
    Assigner
    References
    Impacted products
    Vendor Product Version
    dunglas mercure Affected: < 0.22.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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