CVE-2017-11126 — The III_i_stereo function in libmpg123/layer3

The III_i_stereo function in libmpg123/layer3.c in mpg123 through 1.25.1 allows remote attackers to cause a denial of service (buffer over-read and application crash) via a crafted audio file that is mishandled in the code for the "block_type != 2" case, a similar issue

01What is this vulnerability?

The III_i_stereo function in libmpg123/layer3.c in mpg123 through 1.25.1 allows remote attackers to cause a denial of service (buffer over-read and application crash) via a crafted audio file that is mishandled in the code for the "block_type != 2" case, a similar issue to CVE-2017-9870.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2017-07-10T03:29:00.253
• Last modified: 2026-05-13T00:24:29.033

09References

• openwall.com — http://openwall.com/lists/oss-security/2017/07/10/4
• blogs.gentoo.org — https://blogs.gentoo.org/ago/2017/07/03/mpg123-global-buffer-overflow-in-iii_i_s…
• openwall.com — http://openwall.com/lists/oss-security/2017/07/10/4
• blogs.gentoo.org — https://blogs.gentoo.org/ago/2017/07/03/mpg123-global-buffer-overflow-in-iii_i_s…