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A buffer overflow vulnerability exists in Asterisk (through 13.19.1, 14.x through 14.7.5, 15.x through 15.2.1, and Certified Asterisk through 13.18-cert2) within the res_pjsip_pubsub module. When handling SUBSCRIBE requests, the module processes Accept headers to store accepted formats. The implementation fails to enforce a limit on the number of Accept headers processed, despite the underlying storage being limited to 32 entries. If a request contains more than 32 Accept headers, the code writes beyond the allocated memory, resulting in a buffer overflow and potential crash.
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