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CVE-2026-22782

RustFS RPC signature verification logs shared secret

2.9 LowFix available

RustFS is a distributed object storage system built in Rust. From >= 1.0.0-alpha.1 to 1.0.0-alpha.79, invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls. In crates/ecstore/src/rpc/http_auth.rs, the invalid signature branch logs sensitive data. This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers. This vulnerability is fixed in 1.0.0-alpha.80.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.52%Up 0.5 points since Jan 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.9

RustFS RPC signature verification logs shared secret

RustFS is a distributed object storage system built in Rust. From >= 1.0.0-alpha.1 to 1.0.0-alpha.79, invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls. In crates/ecstore/src/rpc/http_auth.rs, the invalid signature branch logs sensitive data. This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers. This vulnerability is fixed in 1.0.0-alpha.80.

Record
CVE-2026-22782
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Weakness
CWE-532
Updated
2026-11-02
EUVDEUVD-2026-2923 2.9

RustFS is a distributed object storage system built in Rust. From >= 1.0.0-alpha.1 to 1.0.0-alpha.79, invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls. In crates/ecstore/src/rpc/http_auth.rs, the invalid signature branch logs sensitive data. This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers. This vulnerability is fixed in 1.0.0-alpha.80.

Record
EUVD-2026-2923
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Updated
2026-11-02
GitHub AdvisoriesGHSA-333v-68xh-8mmq 2.9

RustFS's RPC signature verification logs shared secret

Summary

Invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls.

Details

In crates/ecstore/src/rpc/http_auth.rs:115-122 , the invalid signature branch logs sensitive data:

if signature != expected_signature {
    error!(
        "verify_rpc_signature: Invalid signature: secret {}, url {}, method {}, timestamp {}, signature {}, expected_signature {}",
        secret, url, method, timestamp, signature, expected_signature
    );

    return Err(std::io::Error::other("Invalid signature"));
}

This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers.

PoC

  1. Run RustFS with error logging enabled.
  2. Send a request with an invalid signature: 
     ts=$(date +%s)
 curl -v \
   -H "x-rustfs-timestamp: $ts" \
   -H "x-rustfs-signature: invalid-signature" \
   "http://localhost:9000/rustfs/rpc/read_file_stream?disk=foo&volume=bar&path=baz&offset=0&length=1"
  3. Observed output: 
     HTTP 403 AccessDenied: Invalid signature
 verify_rpc_signature: Invalid signature: secret rustfsadmin, url /rustfs/rpc/read_file_stream?disk=foo&volume=bar&path=baz&offset=0&length=1, method GET, timestamp 1767852115, signature invalid-signature, expected_signature oisNxNRTb80GXf97s/PGdScJzu8QB9Oxs+uOwf8RiK8=

Impact

  • Exposes the shared RPC HMAC secret to log readers.
  • Enables attackers with log access to forge valid RPC signatures and make unauthorized RPC calls.
Record
GHSA-333v-68xh-8mmq
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Weakness
CWE-532
Updated
2026-11-02
NVD 2.9

RustFS is a distributed object storage system built in Rust. From >= 1.0.0-alpha.1 to 1.0.0-alpha.79, invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls. In crates/ecstore/src/rpc/http_auth.rs, the invalid signature branch logs sensitive data. This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers. This vulnerability is fixed in 1.0.0-alpha.80.

Record
CVE-2026-22782
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-532
Updated
2026-11-02
OSV 2.9

RustFS RPC signature verification logs shared secret

RustFS is a distributed object storage system built in Rust. From >= 1.0.0-alpha.1 to 1.0.0-alpha.79, invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls. In crates/ecstore/src/rpc/http_auth.rs, the invalid signature branch logs sensitive data. This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers. This vulnerability is fixed in 1.0.0-alpha.80.

Record
CVE-2026-22782
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Weakness
CWE-532
Updated
2026-11-02
OSVGHSA-333v-68xh-8mmq 2.9

RustFS's RPC signature verification logs shared secret

Summary

Invalid RPC signatures cause the server to log the shared HMAC secret (and expected signature), which exposes the secret to log readers and enables forged RPC calls.

Details

In crates/ecstore/src/rpc/http_auth.rs:115-122 , the invalid signature branch logs sensitive data:

if signature != expected_signature {
    error!(
        "verify_rpc_signature: Invalid signature: secret {}, url {}, method {}, timestamp {}, signature {}, expected_signature {}",
        secret, url, method, timestamp, signature, expected_signature
    );

    return Err(std::io::Error::other("Invalid signature"));
}

This log line includes secret and expected_signature, both derived from the shared HMAC key. Any invalidly signed request triggers this path. The function is reachable from RPC and admin request handlers.

PoC

  1. Run RustFS with error logging enabled.
  2. Send a request with an invalid signature: 
     ts=$(date +%s)
 curl -v \
   -H "x-rustfs-timestamp: $ts" \
   -H "x-rustfs-signature: invalid-signature" \
   "http://localhost:9000/rustfs/rpc/read_file_stream?disk=foo&volume=bar&path=baz&offset=0&length=1"
  3. Observed output: 
     HTTP 403 AccessDenied: Invalid signature
 verify_rpc_signature: Invalid signature: secret rustfsadmin, url /rustfs/rpc/read_file_stream?disk=foo&volume=bar&path=baz&offset=0&length=1, method GET, timestamp 1767852115, signature invalid-signature, expected_signature oisNxNRTb80GXf97s/PGdScJzu8QB9Oxs+uOwf8RiK8=

Impact

  • Exposes the shared RPC HMAC secret to log readers.
  • Enables attackers with log access to forge valid RPC signatures and make unauthorized RPC calls.
Record
GHSA-333v-68xh-8mmq
CVSS 4.0
2.9 LowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Weakness
CWE-532
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
rustfs
crates.io
 1.0.0-alpha.1 to 1.0.0-alpha.79
1.0.0-alpha.80
rustfs
crates.io
 1.0.0-alpha.1 up to 1.0.0-alpha.80
1.0.0-alpha.80

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-22782 is a low vulnerability (CVSS 2.9) in Rustfs, published January 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in rustfs 1.0.0-alpha.80.

References

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