How severe is CVE-2025-69255?

No CVSS score has been assigned to CVE-2025-69255 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-69255?

CVE-2025-69255 affects the following packages: rustfs (crates.io). Ecosystems affected: crates.io.

How do I fix CVE-2025-69255?

Update rustfs to 1.0.0-alpha.78 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-69255 is resolved across your whole dependency graph.

How do I detect CVE-2025-69255 in my crates.io dependencies?

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

How do I mitigate CVE-2025-69255 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.

How does O3 Security protect against CVE-2025-69255?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2025-69255 can be triaged on real exposure rather than presence alone.

Is CVE-2025-69255 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-69255 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.

What is the EPSS score for CVE-2025-69255?

CVE-2025-69255 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 23th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-69255?

CVE-2025-69255 is classified as CWE-755 (CWE-755). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-69255 published, and has it been updated?

CVE-2025-69255 was published on January 7, 2026 and was last updated on August 12, 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

CVE-2025-69255 — rustfs

Fix: rustfs/rustfs@eb33e82

CVE-2025-69255 is a CWE-755 vulnerability in rustfs. A fix is available for rustfs — see the affected versions and patch details below.

RustFS gRPC GetMetrics deserialization panic enables remote DoS

Also known asGHSA-gw2x-q739-qhcr

Published

Jan 7, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 24, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-69255.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs23th percentile — riskier than 23% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

🦀rustfs

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

Summary

A malformed gRPC GetMetrics request causes get_metrics to unwrap() failed deserialization of metric_type/opts, panicking the handler thread and enabling remote denial of service of the metrics endpoint.

Details

Vulnerable code: rustfs/src/storage/tonic_service.rs:1775-1782:
- MetricType and CollectMetricsOpts are deserialized with Deserialize::deserialize(...).unwrap() from client-supplied bytes.
- Malformed metric_type/opts (e.g., empty or truncated rmp-serde payloads) trigger InvalidMarkerRead and panic.
Reachability: same TCP listener as S3 (default :9000); only a static interceptor token authorization: rustfs rpc is checked in server/http.rs:677.
Impact scope: panic terminates the worker handling the request, causing metrics service interruption and potential process instability.

PoC

rustfs-grpc-metrics-invalid-metric-type-panic-poc.tar.gz

Start RustFS (example local dev):

mkdir -p /tmp/rustfs-data1 /tmp/rustfs-data2
RUSTFS_ACCESS_KEY=devadmin RUSTFS_SECRET_KEY=devadmin \
  cargo run --bin rustfs -- --address 0.0.0.0:9000 \
  /tmp/rustfs-data1 /tmp/rustfs-data2

From rustfs-grpc-metrics-invalid-metric-type-panic-poc/, run:

ENDPOINT=127.0.0.1:9000 make run
# or: grpcurl -plaintext \
#   -H 'authorization: rustfs rpc' \
#   -import-path ../crates/protos/src -proto node.proto \
#   -d '{"metric_type":"","opts":""}' \
#   127.0.0.1:9000 node_service.NodeService/GetMetrics

Observe panic in server logs at tonic_service.rs:get_metrics with InvalidMarkerRead and worker crash; client output saved to poc-response.txt/poc-grpcurl.log.

Impact

Vulnerability type: remote unauthenticated (static token) denial of service via panic in gRPC handler.
Who is impacted: any deployment exposing the gRPC endpoint where an attacker can reach port 9000 and supply the known authorization: rustfs rpc header; metrics service is disrupted and may affect overall stability depending on runtime crash handling.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`rustfs`	≥ 1.0.0-alpha.13&&< 1.0.0-alpha.78	1.0.0-alpha.78`cargo update -p rustfs --precise 1.0.0-alpha.78`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rustfs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rustfs to 1.0.0-alpha.78 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-69255 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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2025-69255 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2025-69255. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary A malformed gRPC `GetMetrics` request causes `get_metrics` to `unwrap()` failed deserialization of `metric_type`/`opts`, panicking the handler thread and enabling remote denial of service of the metrics endpoint. ### Details - Vulnerable code: `rustfs/src/storage/tonic_service.rs:1775-1782`: - `MetricType` and `CollectMetricsOpts` are deserialized with `Deserialize::deserialize(...).unwrap()` from client-supplied bytes. - Malformed `metric_type`/`opts` (e.g., empty or truncated rmp-serde payloads) trigger `InvalidMarkerRead` and panic. - Reachability: same TCP listener as S3 (

O3 Security · Impact-Aware SCA

Is CVE-2025-69255 in your dependencies?

O3 Security finds CVE-2025-69255 across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

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