unbounded-spsc: Sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race
Priority MEDIUM 59CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
unbounded_spsc is an "unbounded" extension of bounded_spsc_queue. In versions 0.2.0 and prior, sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race. At time of publication, there are no publicly available patches.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0013 2nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| spearman | unbounded-spsc | up to 0.2.0 | — | No fix listed | CNA |
| — | unbounded-spsc (crates.io) | up to 0.2.0 | — | No fix listed | GHSA-6m57-8r3p-pqx6 |
- unbounded-spsc Vendorspearman Affected up to 0.2.0 Fixed in — No fix listed CNA
- unbounded-spsc (crates.io) Vendor— Affected up to 0.2.0 Fixed in — No fix listed GHSA-6m57-8r3p-pqx6
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-46690
- 2026-10-03 Alias added: GHSA-6m57-8r3p-pqx6
References
Sources
- CVE-2026-46690 · CVE Program
- CVE-2026-46690 · NVD
- FIRST EPSS
- GHSA-6m57-8r3p-pqx6 · GitHub Advisory Database · CC BY 4.0
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