---
id: CVE-2026-116741
title: Speex through 1.2.1 Out-of-Bounds Write via speex_bits_read_whole_bytes
summary: >-
  Speex (libspeex) through 1.2.1 contains an out-of-bounds write vulnerability
  in speex_bits_read_whole_bytes() in libspeex/bits.c that mishandles length
  truncation for non-owned SpeexBits buffers. Attackers can stream crafted Speex
  data i…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: xiph
product: speex
affected:
  - speex <= 1.2.1
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T21:52:40.782Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116741'
references:
  - url: 'https://github.com/xiph/speex/issues/42'
    label: 'GitHub Issue #42'
  - url: 'https://github.com/xiph/speex'
  - url: 'https://github.com/xiph/speex/blob/Speex-1.2.1/libspeex/bits.c#L177'
  - url: 'https://hackmd.io/@haindpwn/speex-bits-read-whole-bytes-oob-write'
  - url: 'https://gitlab.xiph.org/xiph/speex/-/merge_requests/32'
  - url: >-
      https://www.vulncheck.com/advisories/speex-through-1.2.1-out-of-bounds-write-via-speex-bits-read-whole-bytes
    label: >-
      VulnCheck Advisory: Speex through 1.2.1 Out-of-Bounds Write via
      speex_bits_read_whole_bytes
tags:
  - cve.org
epss: 0.00409
epssPercentile: 0.34937
ingestedAt: '2026-10-27T16:11:59.124Z'
---

## Overview

Speex (libspeex) through 1.2.1 contains an out-of-bounds write vulnerability in speex_bits_read_whole_bytes() in libspeex/bits.c that mishandles length truncation for non-owned SpeexBits buffers. Attackers can stream crafted Speex data into buffers set up with speex_bits_init_buffer() or speex_bits_set_bit_buffer() to corrupt heap or stack memory and crash applications.

## Affected

- `speex <= 1.2.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.