CVE-2026-57199
Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct buffers
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, `app_sms.c` copies externally controlled `SMS` lengths into `fixed in-struct buffers` without sufficient bounds checks, allowing an attacker to corrupt memory or crash Asterisk. The administrator must explicitly use the `SMS` dialplan application, which is useful when routing calls to or from `analog devices`, and must not have ensured that data passed to the application is valid. 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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| asterisk asterisk |
< 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) |
CNA: GitHub_M |
| certified-asterisk asterisk |
< 20.7-cert11 (affected) >= 22.8-cert1-pre1, < 22.8-cert3 (affected) |
CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/asterisk/asterisk/security/advisories/GHSA-q9fr-m7g8-6ph5CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/asterisk/asterisk/commit/15c66022dc441ec63d7bd5f53cf7f35db72964beCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/38a2059eb77a91a6b6e76eeba5875c2b96027368CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/59b74276f24ba104d859f3f05897c9b8d835a28aCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/60f4ef3deac6b9af30519b46c13f103264038b82CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/661d6a2fc5cc7744ab9d849ed3c73ae5066386dfCNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/7048a3841df99e090b9d87246600373581629c98CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/f46f63bd4d33665d336cf8b5998650b915222549CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/20.20.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/21.12.3CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/22.10.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/23.4.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3CNA: GitHub_M · x_refsource_MISC
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1CNA: GitHub_M · x_refsource_MISC
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