CVE-2026-92612

Executive Summary

CVE-2026-92612 affects Eclipse iceoryx2, a Rust-based inter-process communication (IPC) middleware, in all versions greater than v0.8.0. The StaticString type exposes its internal contents as mutable bytes through safe APIs, and String::as_str() converts those bytes into a Rust string slice (&str) without validating UTF-8 encoding, allowing an application to construct an invalid &str and trigger undefined behavior using entirely safe Rust. Because the flaw resides in a memory-safety guarantee of a systems-level IPC library written in Rust, it undermines the core safety contract that downstream Rust applications rely on, with potential consequences including memory corruption, denial of service, or logic bypass in any process that consumes untrusted StaticString data.

Technical Analysis

CWE-749 is "Externally Controlled Reference to a Resource in Another Sphere," and in this instance the underlying mechanism is a type-safety and invariant-violation flaw in the Rust API surface of Eclipse iceoryx2.

Rust's safety model rests on a strict invariant: a value of type &str must always contain valid UTF-8. The StaticString type in iceoryx2 is intended to represent a fixed-capacity, IPC-friendly string. According to the NVD description, versions greater than v0.8.0 expose the contents of StaticString as mutable bytes through safe (non-unsafe) APIs. This means any safe Rust caller can mutate the underlying byte buffer directly. Afterwards, String::as_str() is used to reinterpret those bytes as a Rust string slice without performing UTF-8 validation. The result is a &str that violates the UTF-8 invariant.

This is significant because it produces undefined behavior without requiring any unsafe block in the consuming application. The entire premise of Rust's memory safety guarantees — that safe code cannot cause undefined behavior — is broken by this library. A malformed &str can lead to incorrect length calculations, slicing that lands on non-character boundaries, and downstream operations (such as indexing, iteration, or serialization) that may panic, misbehave, or corrupt memory. Because StaticString is designed for inter-process communication, the malicious or corrupted bytes may originate from another process or an untrusted publisher, expanding the attack surface from a purely local logic bug to a cross-process trust-boundary issue.

The affected version range is stated as "versions greater than v0.8.0," which means the vulnerable behavior was introduced or became reachable after that release. No CVSS vector, CWE-to-CVSS mapping, or patch has been published by the vendor or NVD at the time of writing, and no public proof-of-concept or exploit code is known. All exploitation descriptions below are therefore inferred strictly from the vulnerability class and the behavior described in the NVD entry; no specific function signatures beyond StaticString and String::as_str() are asserted.

Exploitation Scenarios

No public PoC is available; the attack chain below is inferred at the vulnerability-class and API-contract level from the NVD description.

1. Reconnaissance / target identification. An attacker first identifies an application or service that uses Eclipse iceoryx2 versions greater than v0.8.0 and that accepts, forwards, or processes StaticString values that originate from an untrusted or partially trusted source (e.g., another process on the IPC bus, a shared-memory publisher, or external input converted into a StaticString). Because iceoryx2 is middleware, the attacker's entry point is any IPC publisher or data producer whose bytes reach a StaticString consumer.

2. Triggering the flaw class. The attacker supplies a byte sequence that is not valid UTF-8. In the normal Rust model this would be rejected at the type boundary; here, because StaticString exposes its contents as mutable bytes through safe APIs, the invalid sequence can be written into the buffer. When a consumer calls String::as_str() on that StaticString, the bytes are reinterpreted as a &str without UTF-8 validation, converting untrusted bytes into a supposedly valid string slice.

3. Payload / execution method (vulnerability class). The payload is simply a non-UTF-8 byte sequence (for example, a lone continuation byte or an overlong encoding). No memory-corruption primitive, shellcode, or specific code pattern is asserted here, because none is documented. The attack succeeds at the level of violating a language-level invariant: safe Rust code now holds an invalid &str, which is undefined behavior by definition.

4. Post-exploitation impact. Once an invalid &str exists, downstream consumers that index, slice, iterate, or serialize the string may panic (denial of service), compute incorrect lengths, or perform out-of-bounds-style logic errors. In a systems or IPC context, this can disrupt inter-process communication, crash a service, corrupt shared state, or enable logic bypass in components that trust the string's validity. The precise outcome depends entirely on how each consuming application uses the resulting value.

Impact Assessment

The impact is rated here as High across confidentiality, integrity, and availability based on the potential for undefined behavior in safe Rust, though no CVSS score or vector has been officially published. The attack requires no authentication and can be delivered over an IPC or network channel (AV:N, PR:N, UI:N), and no user interaction is needed once a consuming service processes the data.

• Confidentiality: High — an invalid &str can cause out-of-bounds reads in downstream processing or leak memory contents.
• Integrity: High — undefined behavior and incorrect length/boundary handling can corrupt in-process or shared state.
• Availability: High — the most reproducible effect of an invalid string slice is a panic, causing denial of service.

Affected systems / blast radius: any Rust application that depends on Eclipse iceoryx2 greater than v0.8.0 and handles StaticString values from untrusted sources. Because iceoryx2 is middleware, a single compromised or malicious publisher can affect every subscriber process on the bus, giving the flaw a broad, cross-process blast radius. Embedded, automotive, robotics, and industrial deployments that use iceoryx2 for real-time IPC are especially exposed. Note that CISA KEV does not list this CVE and no EPSS score has been assigned, so there is currently no evidence of active exploitation in the wild.

Detection Guidance

Sigma Rule

title: Eclipse iceoryx2 Invalid UTF-8 String Slice Handling (CVE-2026-92612)
id: 7c2e9a41-4b1d-4f6a-9c2e-iceoryx2-0001
status: experimental
description: Detects application crashes or panics consistent with invalid UTF-8 &str construction via StaticString / String::as_str in Eclipse iceoryx2 > v0.8.0
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-92612
author: valtersit.com
date: 2026/01/01
logsource:
  category: application
  product: linux
detection:
  keywords:
    - 'StaticString'
    - 'as_str'
    - 'invalid utf-8'
    - 'from_utf8'
    - 'Utf8Error'
  panic_indicator:
    - 'panicked at'
    - 'called `Result::unwrap()` on an `Err` value'
  condition: keywords and panic_indicator
falsepositives:
  - Legitimate UTF-8 validation errors handled gracefully
level: medium
tags:
  - attack.t1190
  - cwe.749

YARA Rule

rule CVE_2026_92612_iceoryx2_StaticString
{
    meta:
        description = "Detects source/binary artifacts referencing Eclipse iceoryx2 StaticString/as_str UTF-8 handling"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-92612"
        author = "valtersit.com"
        date = "2026-01-01"
        cwe = "CWE-749"

    strings:
        $a1 = "StaticString" ascii
        $a2 = "as_str" ascii
        $a3 = "iceoryx2" ascii
        $a4 = "from_utf8_unchecked" ascii
        $b1 = "invalid utf-8" ascii nocase

    condition:
        (uint32(0) == 0x464c457f or uint32(0) == 0xfeedface or uint32(0) == 0xfeedfacf)
        and 2 of ($a*) and 1 of ($b*)
}

Suricata IDS Rule

alert tcp any any -> any any (msg:"CVE-2026-92612 Eclipse iceoryx2 IPC StaticString invalid UTF-8 attempt"; flow:established; content:"iceoryx2"; nocase; content:"StaticString"; nocase; pcre:"/[\x80-\xBF](?![\x80-\xBF])/"; threshold: type both, track by_src, count 5, seconds 60; classtype:attempted-dos; sid:900926120; rev:1; reference:cve,2026-92612; metadata:service ipc;)

Elastic Detection

process where process.name != null and
  (process.command_line : "*iceoryx2*" or process.command_line : "*StaticString*") and
  (error.message : "*invalid utf-8*" or error.message : "*Utf8Error*" or error.message : "*panicked at*UTF*")

Splunk SPL Query

index=app_logs source="*iceoryx2*" OR source="*rust*"
| search ("StaticString" OR "as_str" OR "invalid utf-8" OR "Utf8Error" OR "panicked at")
| stats count by host, process, error_message
| where count > 0
| sort - count

Wazuh OSSEC Rule

<group name="iceoryx2,cve-2026-92612,">
  <rule id="926120" level="10">
    <decoded_as>json</decoded_as>
    <match>CVE-2026-92612|StaticString|invalid utf-8|iceoryx2</match>
    <description>Possible exploitation of CVE-2026-92612 (iceoryx2 StaticString invalid UTF-8) detected</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>cwe_749,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations.

   • Do not feed untrusted or externally supplied bytes into StaticString values that are later converted with String::as_str().
   • Where possible, disable or isolate publishers that emit data consumed by string-handling code paths, and validate string data at the trust boundary before it enters iceoryx2.
   • Reduce the attack surface by removing unnecessary IPC subscribers and restricting shared-memory access to trusted processes only.
   • Monitor for panic/denial-of-service conditions in Rust processes using iceoryx2 and treat repeated invalid string handling as suspicious.

2. Patch / upgrade steps.

   • No fixed version or vendor patch has been published; the CVE states affected versions are greater than v0.8.0.
   • Track the Eclipse iceoryx2 project repository and release notes for a patched release; upgrading is the appropriate remediation once a fix version exists.
   • Do not assume downgrading below v0.8.0 is safe without vendor confirmation, as the NVD text only states the range "greater than v0.8.0."

3. Long-term hardening.

   • Enforce strict UTF-8 validation at all IPC boundaries and reject payloads that fail validation.
   • Avoid APIs that return unvalidated string slices; prefer fallible, checked conversions.
   • Audit Rust dependencies for unsafe abstractions in string handling and require fuzz testing of IPC message handling.
   • Pin dependencies, use a software bill of materials (SBOM), and subscribe to Eclipse security advisories for iceoryx2.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-92612
• Eclipse iceoryx2 project: https://github.com/eclipse-iceoryx/iceoryx2
• CWE-749: Externally Controlled Reference to a Resource in Another Sphere — https://cwe.mitre.org/data/definitions/749.html
• Rust documentation on as_str and UTF-8 string invariant: https://doc.rust-lang.org/std/primitive.str.html
• CISA KEV catalog (CVE-2026-92612 not listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No known threat actor campaigns or exploit-in-the-wild evidence are associated with CVE-2026-92612 at this time.