How severe is GHSA-255r-3prx-mf99?

No CVSS score has been assigned to GHSA-255r-3prx-mf99 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-255r-3prx-mf99?

GHSA-255r-3prx-mf99 affects the following packages: rmp-serde (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-255r-3prx-mf99?

Update rmp-serde to 1.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-255r-3prx-mf99 is resolved across your whole dependency graph.

How do I detect GHSA-255r-3prx-mf99 in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rmp-serde, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-255r-3prx-mf99 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-255r-3prx-mf99 actively exploited in the wild?

No public exploit code has been indexed for GHSA-255r-3prx-mf99 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-255r-3prx-mf99 published, and has it been updated?

GHSA-255r-3prx-mf99 was published on March 22, 2023 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

`rmp-serde` `Raw` and `RawRef` may crash when receiving invalid UTF-8GHSA-255r-3prx-mf99

GHSA-255r-3prx-mf99 is a security vulnerability in rmp-serde. A fix is available for rmp-serde — see the affected versions and patch details below.

Also known asRUSTSEC-2022-0092

Published

Mar 22, 2023

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀rmp-serde

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

It was found that Raw::from_utf8 expects valid UTF-8. If invalid UTF-8 is received it can cause the process to crash.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`rmp-serde`	all versions	1.1.1`cargo update -p rmp-serde --precise 1.1.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rmp-serde, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rmp-serde to 1.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-255r-3prx-mf99 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

It was found that `Raw::from_utf8` expects valid UTF-8. If invalid UTF-8 is received it can cause the process to crash.

O3 Security · Impact-Aware SCA

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Find it across crates.io, including transitive dependencies.

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