High Info disclosure exploit reference

CVE-2026-22782 — 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.

Published Jan 16, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: GitHub_M

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.5% (30-day exploitation probability)+6
Technical severity (high)+6
CISA SSVC: exploitation "poc"+5
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.52%

ahead of 43% of scored CVEs · Oct 15, 2026

Affects

Rustfs

CVSS base

7.5

High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — github.com (NIST National Vulnerability Database)
Documented patch — github.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Rustfs Rustfs).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (info disclosure), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Rustfs	Rustfs	version 1.0.0-alpha55version 1.0.0-alpha63version 1.0.0-alpha62version 1.0.0-alpha61version 1.0.0-alpha60version 1.0.0-alpha6version 1.0.0-alpha59version 1.0.0-alpha58 and 71 more version 1.0.0-alpha57version 1.0.0-alpha56version 1.0.0-alpha64version 1.0.0-alpha54version 1.0.0-alpha53version 1.0.0-alpha52version 1.0.0-alpha51version 1.0.0-alpha50version 1.0.0-alpha5version 1.0.0-alpha49version 1.0.0-alpha48version 1.0.0-alpha47version 1.0.0-alpha73version 1.0.0-alpha9version 1.0.0-alpha8version 1.0.0-alpha79version 1.0.0-alpha78version 1.0.0-alpha77version 1.0.0-alpha76version 1.0.0-alpha75version 1.0.0-alpha74version 1.0.0-alpha46version 1.0.0-alpha72version 1.0.0-alpha71version 1.0.0-alpha70version 1.0.0-alpha7version 1.0.0-alpha69version 1.0.0-alpha68version 1.0.0-alpha67version 1.0.0-alpha66version 1.0.0-alpha65version 1.0.0-alpha19version 1.0.0-alpha27version 1.0.0-alpha26version 1.0.0-alpha25version 1.0.0-alpha24version 1.0.0-alpha23version 1.0.0-alpha22version 1.0.0-alpha21version 1.0.0-alpha20version 1.0.0-alpha2version 1.0.0-alpha28version 1.0.0-alpha18version 1.0.0-alpha17version 1.0.0-alpha16version 1.0.0-alpha15version 1.0.0-alpha14version 1.0.0-alpha13version 1.0.0-alpha12version 1.0.0-alpha11version 1.0.0-alpha10version 1.0.0-alpha37version 1.0.0-alpha45version 1.0.0-alpha44version 1.0.0-alpha43version 1.0.0-alpha42version 1.0.0-alpha41version 1.0.0-alpha40version 1.0.0-alpha4version 1.0.0-alpha39version 1.0.0-alpha38version 1.0.0-alpha1version 1.0.0-alpha36version 1.0.0-alpha35version 1.0.0-alpha34version 1.0.0-alpha33version 1.0.0-alpha32version 1.0.0-alpha31version 1.0.0-alpha30version 1.0.0-alpha3version 1.0.0-alpha29	Vulnerable	NIST National Vulnerability Database
Rustfs	Rustfs	version >= 1.0.0-alpha.1, < 1.0.0-alpha.80	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
2.9	CVSS 4.0	Low	—	—	security-advisories@github.com via NIST National Vulnerability Database
2.9	CVSS 4.0	Low	—	—	GitHub_M via CVE Program (cve.org) e CISA ADP
7.5	CVSS 3.1	High	3.9	3.6	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-532 · Insertion of Sensitive Information into Log File

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 0.52%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Look for anomalous data read/export volumes and access to sensitive records.

web/proxy/WAF logsnetwork IDS/IPSapplication logsauthentication logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · rustfs/rustfs
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 7.5
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jan 16, 2026 · GitHub_M

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

3 on the record

github.com/rustfs/rustfs/security/advisories/GHSA-333v-68xh-8mmq
Exploit, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
github.com/rustfs/rustfs/commit/6b2eebee1d07399ef02c0863bd515b4412a5a560
Patch, x_refsource_MISC, NIST National Vulnerability Database
github.com/rustfs/rustfs/blob/9e162b6e9ebb874cc1d06a7b33bc4a05786578aa/crates/ec
Patch, x_refsource_MISC, NIST National Vulnerability Database

Elsewhere on this site

Rustfs
every CVE for this vendor

Info disclosure
same class

CWE-532
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-73290 RustFS: Anonymous ListObjectVersions bypasses RestrictPublicBuckets through the ListBucket fallback Aug 12, 2026
High CVE-2026-73286 RustF: Request headers can populate server-derived IAM condition keys, letting a caller satisfy identity-based policy conditions Aug 12, 2026
Medium CVE-2026-73287 RustFS: FTPS MKD bypasses IAM CreateBucket authorization Aug 12, 2026
High CVE-2026-73289 RustFS: ForAllValues/ForAnyValue negated string conditions are transposed, inverting IAM and bucket-policy decisions Aug 12, 2026
Medium CVE-2026-73288 RustFS: Object Lock (WORM) protections are treated as absent when bucket metadata cannot be read, allowing retained objects to be deleted Aug 12, 2026
Medium CVE-2026-73265 RustFS: Version-specific object reads authorize the non-version action Aug 12, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-22782 is "RustFS RPC signature verification logs shared secret", rated High. It affects Rustfs (Rustfs); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. EPSS 0.52% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.