PYSEC-2026-3880

    Dashboard / Vulnerabilities / PYSEC-2026-3880

    PYSEC-2026-3880

    Published: 10 Sept 2026Last Modified: 10 Sept 2026

    Summary: OpenHarness remote project-context commands allow persistent prompt poisoning

    Details: OpenHarness /issue and /pr_comments slash commands lack remote_invocable=False protection, allowing remote channel senders to write attacker-controlled Markdown into project context files. Admitted remote attackers can inject malicious content into .openharness/issue.md and .openharness/pr_comments.md files, which are subsequently injected into runtime system prompts, persistently influencing local agent behavior.

    References: https://nvd.nist.gov/vuln/detail/CVE-2026-56696, https://github.com/HKUDS/OpenHarness/pull/272, https://github.com/HKUDS/OpenHarness/commit/27bb93b810e9ea8fa4832eab7152eeb3b4a6bffb, https://github.com/HKUDS/OpenHarness, https://www.vulncheck.com/advisories/openharness-prompt-injection-via-issue-and-pr-comments-slash-commands, https://pypi.org/project/openharness-ai, https://github.com/advisories/GHSA-24cw-228q-3rx9

    Affected packages

    Package

    Name: openharness-ai

    Purl: pkg:pypi/openharness-ai

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.1.0
    0.1.1
    0.1.2
    0.1.3
    0.1.4
    0.1.5
    0.1.6
    0.1.7
    0.1.8
    0.1.9

    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
    PYSEC-2026-3880 | CVE-DB