SB2026052528 - Multiple vulnerabilities in Asterisk Open Source and Certified Asterisk

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Main Vulnerability Database SB2026052528

SB2026052528 - Multiple vulnerabilities in Asterisk Open Source and Certified Asterisk

Published: May 25, 2026

Security Bulletin ID SB2026052528
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 75% Medium 25%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2026-28799)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the presence subscription termination handler. A remote attacker can execute arbitrary code on the target system.


2) Use-after-free (CVE-ID: CVE-2026-32942)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in the ICE session when race conditions occur between session destruction and callbacks. A remote attacker can trigger concurrent session destruction and callback execution to execute arbitrary code.

Any application using the ICE feature is potentially affected.


3) Out-of-bounds read (CVE-ID: CVE-2026-33069)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose adjacent heap memory.

The vulnerability exists due to an out-of-bounds read in pjsip_multipart_parse() when parsing SIP multipart bodies. A remote attacker can send a specially crafted SIP message to disclose adjacent heap memory.

Applications that process incoming SIP messages with multipart bodies or SDP content are potentially affected.


4) Stack-based buffer overflow (CVE-ID: CVE-2026-25994)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber


The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to stack-based buffer overflow in PJNATH ICE Session when processing credentials with excessively long usernames. A remote attacker can send crafted credentials with an excessively long username to cause a denial of service or execute arbitrary code.

This issue affects applications that use ICE.


Remediation

Install update from vendor's website.

References