CVE-2026-57192
Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a heap buffer overflow through an out-of-bounds write in the `Codec2` decoder caused by a `floor/ceil sample-count mismatch`. The `codec_codec2` module must be loaded and `Codec2` must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or `source IP address matching`, establish a call using `Codec2`, and send carefully crafted `Codec2` audio packets. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.
Timeline
ID reserved
By GitHub_M
- 4 months later
· 4 months later
Published
- 7 days later
· 7 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Medium6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| NVDNVD · Undergoing Analysis | 4.0 | Medium6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.65% · top 49% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.0.
Weakness
Affected products
- affected < 20.20.1
- affected >= 21.0.0-pre1, < 21.12.3
- affected >= 22.0.0-pre1, < 22.10.1
- affected >= 23.0.0-pre1, < 23.4.1
- affected < 20.7-cert11
- affected >= 22.8-cert1-pre1, < 22.8-cert3
References (15)
- https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acb (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434c (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0d (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/20.20.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/21.12.3 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/22.10.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/23.4.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-57192)Record last updated .