CVE-2017-18587
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn issue was discovered in the hyper crate before 0.9.18 for Rust. It mishandles newlines in headers.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe hyper crate before version 0.9.18 for Rust improperly handles newlines in HTTP headers, potentially allowing HTTP header injection or HTTP response splitting attacks. This occurs because the crate fails to properly sanitize or reject headers containing newline characters (\r\n), which could be leveraged by attackers to inject additional headers or split responses.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 0.9.18>= 0.10.0, < 0.10.2CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate hyper crate in dependenciesSearch your project's Cargo.toml and Cargo.lock files for 'hyper' and note the version number specifiedAffected if The hyper version listed is less than 0.9.18, or greater than or equal to 0.10.0 but less than 0.10.2
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Verify installed hyper versionRun 'cargo tree -p hyper' or 'cargo list --depth=1' to see the resolved version of hyper in your buildAffected if The resolved version matches the affected ranges: < 0.9.18 OR >= 0.10.0 AND < 0.10.2
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Identify header processing codeSearch your codebase for uses of hyper's header types, particularly header() method calls or HeaderMap operations that set or modify HTTP headersAffected if Your code uses hyper to set, modify, or forward HTTP headers from external input
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Check if header values originate from untrusted inputReview the code paths that populate header values and trace whether any come from user requests, query parameters, form data, or external APIsAffected if Header values can be influenced by untrusted or user-supplied data without validation before being passed to hyper
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Inspect header validation practicesSearch for any existing validation or sanitization of header values, looking for checks that strip or reject newline characters (\r\n) before passing headers to hyperAffected if No validation exists to reject or remove newline characters from header values before they are processed by hyper
Your environment is affected if you use a hyper crate version within the vulnerable range and your application processes headers containing untrusted input without first validating and stripping newline characters.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data0.9.180.10.2
Update the hyper crate to version 0.9.18 or later, which includes proper validation and sanitization of header values to reject newline characters. After upgrading, test all code paths that handle HTTP headers to ensure correct behavior.
- Consultation2.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-18587 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-18587 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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