CVE-2026-87724

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    CVE-2026-87724

    Published: 9 Sept 2026Last Modified: 11 Sept 2026

    Summary:

    Details: Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remote attackers to cause a denial of service (crash) because of corrupted congestion-control state. This is TROVE-2026-032.

    References: https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.12/ChangeLog, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87724.json, https://nvd.nist.gov/vuln/detail/CVE-2026-87724, https://gitlab.com/torproject/tor/-/commit/10d4b8ffefa7c00aab2b631ed7e7f15e42cd012d

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 1ee22f8f9a98719d32e5e4056013b68054b6448d
    Fixed -78923280eed3eff6a77910bba59ecc1fa2244e02

    Affected versions

    tor-0.4.9.11
    tor-0.4.9.10
    tor-0.4.9.9
    tor-0.4.9.8
    tor-0.4.9.7
    tor-0.4.9.6
    tor-0.4.9.5
    tor-0.4.9.4-rc
    tor-0.4.9.3-alpha

    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
    CVE-2026-87724 | CVE-DB