Vulnerability · Published Jun 12, 2026 · Assigned by GitHub_M
CVE-2026-46690unbounded-spsc: Sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race
Medium 5.8
In plain English
A medium-severity out-of-bounds read in unbounded-spsc from spearman. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)5.8Medium
Exploit odds (30 days)0.1%top 97.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| spearman | unbounded-spsc | <= 0.2.0 |
Weakness: CWE-125, CWE-415, CWE-704, CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H