Is CVE-2026-45039 actively exploited?

No active exploitation of CVE-2026-45039 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45039 be exploited remotely?

Yes. CVE-2026-45039 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45039?

CVE-2026-45039 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2026-45039

CRITICAL

CVE-2026-45039

CWE-798Published: May 28, 2026· Updated: May 29, 2026

9.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.0th

Official Description

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, get_shared_secret() in crates/ecstore/src/rpc/http_auth.rs, falls back to the public, source-tree-embedded DEFAULT_SECRET_KEY = "rustfsadmin" when neither the RUSTFS_RPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2.

NVD Source

Risk Analysis

This critical vulnerability in RustFS, a distributed object storage system, allows an unauthenticated remote attacker to bypass authentication. The system defaults to a publicly known shared secret key if not explicitly configured, enabling unauthorized access to the system. With a CVSS score of 9.8, this flaw poses a severe risk to data confidentiality, integrity, and availability.

No public exploit is known for this remotely exploitable vulnerability. The attack complexity is low, making it easier to exploit if an attacker discovers a method.

Recommended Action

Upgrade RustFS to version 1.0.0-beta.2 or later. Ensure that the RUSTFS_RPC_SECRET environment variable or the global S3 secret key is configured with a strong, unique secret to prevent fallback to the default key.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-45039 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.