CVE-2026-124959: Spotify Voyager · Out-of-bounds Write
Affects Spotify VoyagerSource CVE Database V5
Not known to be exploited.
Data as of 9 Nov 2026, 16:03 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 9 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| SpotifyVoyager | Affected
| Fixed in– |
| hnswlibhnswlib | Affected
| Fixed in– |
AI-suggested
Until a fix is available, users should avoid loading untrusted or unauthenticated HNSW index files to mitigate risk.
Description
CVE-2026-124959 is an out-of-bounds write vulnerability in the loadIndex function of Spotify Voyager and related libraries nmslib and hnswlib. The vulnerability arises because the function does not verify that the element count in a serialized HNSW index is within the allocated buffer capacity. An attacker can craft a malicious index file with an element count exceeding the stored capacity, causing the loader to write beyond the allocated heap buffer and potentially crash the application.