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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A private vulnerability report is a request to investigate and coordinate—not proof that a flaw is exploitable, and not something to debate in a public issue. A reliable response is to acknowledge it promptly, verify the affected code and impact, assign an owner, agree on updates and disclosure, then test and publish a fix users can apply. The exact timeline depends on the risk and your capacity; there is no universal deadline for every maintainer.
Set up a private reporting route before you need one
Publish a security policy that tells researchers how to report a vulnerability and what information to include. For a GitHub repository, a SECURITY.md file and GitHub’s private vulnerability reporting feature are separate: the policy provides instructions, while the feature lets a researcher submit a report directly to maintainers by proposing a draft advisory. GitHub says the feature is available for public repositories when an owner or administrator enables it. See GitHub’s private reporting instructions.
If private reporting is enabled, GitHub’s default form requests a summary, details, proof of concept, and impact; maintainers can customize it. GitHub notifies maintainers of a submission and automatically adds the reporter as a collaborator and credited user on the proposed advisory. A policy file may still show guidance above the form.
If the feature is unavailable, use the contact route in the repository’s security policy. If there is no policy or contact route, GitHub documents asking publicly for a preferred security contact. Keep that request generic: an issue is immediately visible, so do not include vulnerability details, reproduction steps, or affected systems in it. GitHub describes both routes in its coordinated disclosure guidance.
#1 Best Overall
Acknowledge receipt without disclosing details
Reply in the private channel as soon as you can, even if you have not yet investigated. Thank the reporter, confirm that the report is under assessment, and give a realistic date or interval for your next update. Avoid promising a fix date before you understand the issue.
GitHub Docs, in “Coordinated disclosure of security vulnerabilities,” advises: “Acknowledge receipt of the vulnerability report as quickly as possible, even if no immediate resources are available for investigation.” If you need more time, send a brief update rather than letting the reporter infer that the report was ignored. Keep any public request for contact information free of technical details.
Triage the report and establish what is affected
Treat the submission as a potential security issue until you have enough evidence to classify it. Start by identifying the project, component, affected versions, environment, and relevant configuration. Review the reporter’s reproduction steps, proof of concept, and stated impact; then assign one person to own the next action and maintain the private conversation.
Try to reproduce the behavior in a controlled environment. If the report is incomplete, ask focused questions—for example, which version and configuration were tested, what access an attacker needs, and what outcome the proof of concept demonstrates. Distinguish a confirmed vulnerability from an ordinary bug, expected behavior, duplicate, or report that cannot yet be assessed for lack of information. Record what you have verified and what remains uncertain; do not equate a plausible report with a confirmed exploit.
Prioritize by risk, not by a score alone
Assess exploitability, likely consequences, affected users and versions, and any evidence of active exploitation. Consider the context of your project and deployment: the same weakness can carry different practical risk depending on who is exposed and what an attacker could do. Record the rationale, the person responsible, and the next action so the decision can be revisited as facts change.
CVSS can help describe severity; it is one measure referenced in the OpenSSF OSS-SIRT draft policy. A score should inform—not replace—your assessment of project-specific impact and urgency. CISA’s guide to vulnerability reporting for election administrators also describes prioritization by risk to mission, but that is an agency example rather than a universal rule for open-source maintainers (CISA guide).
Agree on coordination and a realistic timeline
Limit access to unpatched details to people who need them to validate or remediate the issue. Agree with the reporter on how often you will provide updates and a target for disclosure. Discuss what you will do if the patch is delayed or details become public prematurely. The target is a coordination plan, not a guarantee that every technical or release dependency will be resolved by that date.
GitHub recommends prompt acknowledgement and timely disclosure, but its reviewed guidance does not set a universal number of hours or days. The OpenSSF OSS-SIRT document is a separate example: its draft v0.1, last updated 2026-06-03, sets that organization’s default targets at acknowledgement within 2 business days and an initial triage or validation assessment within 10 business days. The draft says timing can vary with severity, active exploitation, or patch complexity, and that timelines are negotiated rather than a hard wall. These are draft targets for that organization, not a standard for all projects (OpenSSF).
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Rank #4
Fix and test the issue privately where practical
Develop a patch or mitigation, identify which supported or deployed versions need attention, and test the correction for both the reported vulnerability and likely regressions. Prepare clear upgrade or mitigation instructions alongside the change so disclosure does not arrive without a usable remedy.
GitHub supports collaboration on a private draft repository advisory. Maintainers can discuss the report with the researcher and, subject to maintainer review and merge, use a temporary private fork. Keep review access limited to the people needed for the work; private coordination is meant to reduce unnecessary exposure, not to skip code review or testing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Disclose with an actionable advisory
Coordinate publication of the advisory and the fixed versions or mitigation steps. Mark the security fix clearly in release notes so downstream users can identify the update. Credit the reporter unless they request anonymity. If publishing full technical details before users can update would create avoidable risk, use judgment about what to disclose immediately and what to delay.
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For each affected release line, make the practical action explicit: which version contains the fix, whether a workaround is available, and whether users need to take any configuration or deployment step. A report is not fully closed for users simply because a patch has merged; they need enough information to decide whether they are affected and how to remediate.
When outside triage capacity may help
A third-party intake or triage service can be relevant when a project or organization lacks the people to handle incoming reports reliably. Before using one, compare confidentiality and access controls, workflow integration, available response capacity, reporter communication, and who remains responsible for validating and fixing the issue. A CISA fact sheet describes a federal model in which a vendor screens and initially triages reports while the agency validates and remediates; that example does not establish a recommendation for every open-source project or the availability of a particular current service (CISA platform fact sheet).
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