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VulnerabilityPublished

CVE-2026-124959: Spotify Voyager · Out-of-bounds Write

Affects Spotify VoyagerSource CVE Database V5

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Not known to be exploited.

Data as of 9 Nov 2026, 16:03 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
SpotifyVoyagerAffected
  • >=2.0.7 <=2.1.1
Fixed in–
hnswlibhnswlibAffected
  • >=0.5.0 <=0.9.0
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.

References

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