# CVE-2026-88386

> As of 2026-09-25, CVE-2026-88386 is a MEDIUM-severity vulnerability, CVSS v3.1 5.5, EPSS 0.1% (99.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-88386 as of 2026-09-25; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-25

## What is CVE-2026-88386?

libsndfile 1.2.2 contains a misaligned memory access issue in psf_binheader_readf() while parsing WAV fmt chunks. A specially crafted WAV file can cause the function to cast an unaligned destination address to unsigned int * and perform a 4-byte store. This results in undefined behavior leading to denial of service.

The record classifies CVE-2026-88386 under weakness class [CWE-122](https://intel.threadlinqs.com/cwe/CWE-122). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on availability. The identifier was first published 11 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.5 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 99.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-24, last modified 2026-09-25

## Is CVE-2026-88386 being exploited?

It currently carries a trending score of 53 in the Threadlinqs vulnerability feed.

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-88386 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-88386

No vendor patch reference has been recorded for CVE-2026-88386 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-88386

No threat campaign in the Threadlinqs corpus currently references CVE-2026-88386, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, NVD. Last verified by Threadlinqs on 2026-09-30. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [github.com](https://github.com/libsndfile/libsndfile/issues/1150)
- [github.com (474e4d328b1e6240b93ec6ed14efb7c6a44bee57)](https://github.com/mhlavink/libsndfileci/commit/474e4d328b1e6240b93ec6ed14efb7c6a44bee57)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-88386
Full detection coverage and IOCs for threats exploiting CVE-2026-88386 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp