Messagepack RsApplication · Messagepack Rs Project
CVE-2021-45693
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 messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
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 deserialize_string_primitive function in the messagepack-rs Rust crate reads from uninitialized memory locations during deserialization. This memory safety vulnerability could allow an attacker to obtain sensitive information from process memory or cause undefined behavior when deserializing malicious MessagePack data.
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
Messagepack RsApplication
< 0.8.1CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Identify messagepack-rs dependencySearch your project's Cargo.toml and Cargo.lock.lock files for 'messagepack-rs' or 'msgpack' and note the version numberAffected if The version is below 0.8.1 or no version is specified (which defaults to an older version)
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Check for deserialize_string_primitive usageSearch your codebase for calls to from_msgpack, from_slice, or similar deserialization functions from the messagepack-rs crateAffected if Your code deserializes MessagePack string data using messagepack-rs functions
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Inspect deserialization data sourceReview code paths where MessagePack data is read - check if data originates from network input, files from users, or other external sourcesAffected if MessagePack data from external or untrusted sources is being deserialized without sanitization
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Verify Rust crate version in buildRun 'cargo tree -p messagepack-rs' or check the compiled dependency version in your build artifacts to confirm the exact version in useAffected if The resolved version is below 0.8.1
You are affected if your project uses messagepack-rs version below 0.8.1 and deserializes string data from MessagePack, especially from untrusted external sources.
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.
dbcve · scoped0.8.1
Update to a patched version of messagepack-rs once available. Until then, avoid deserializing MessagePack data from untrusted sources.
messagepack-rs version 0.8.1 or later
- Check the current version of messagepack-rs in your Cargo.toml or Cargo.lock file
- Update the dependency in Cargo.toml to specify version 0.8.1 or later (e.g., messagepack-rs = "0.8.1")
- Run `cargo update` to update the dependency to the latest compatible version
- Run `cargo build` to rebuild the project with the patched version
- Run your test suite to verify the fix does not break existing functionality
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Messagepack Rs
Scoped from the published advisory
- Consultation3.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,416.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-45693 — 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-2021-45693 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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