CVE-2025-49140: 
IPFS vulnerability analysis and mitigation

Pion Interceptor, a framework for building RTP/RTCP communication software, contains a critical vulnerability (CVE-2025-49140) affecting versions v0.1.36 through v0.1.38. The vulnerability exists in the RTP packet factory component where improper handling of RTP padding can be exploited to trigger a panic in Pion-based SFU (Selective Forwarding Unit) systems via crafted RTP packets (GitHub Advisory).

The vulnerability stems from insufficient validation of padding length in RTP packets. When processing packets with the P-bit set, the code fails to properly validate that the padding length is both greater than zero and less than or equal to the payload length. This oversight can lead to a buffer overflow condition, ultimately resulting in a panic. The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (HIGH) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating it can be exploited remotely with no special privileges or user interaction required (GitHub Advisory, Wiz).

The primary impact of this vulnerability is a Denial of Service (DoS) condition. When successfully exploited, it can cause Pion-based SFU systems to crash, disrupting communication services. The vulnerability specifically affects availability while maintaining confidentiality and integrity of the system (Wiz).

The vulnerability can be exploited remotely by sending specially crafted RTP packets to a Pion-based SFU system. The attack requires no authentication or special privileges, making it relatively easy to exploit. The issue only affects users that use pion/interceptor (GitHub Advisory).

Users should upgrade to Pion Interceptor version v0.1.39 or later, which includes validation checks ensuring padLen > 0 && padLen <= payloadLength and returns an error on overflow instead of panicking. For those unable to upgrade immediately, a workaround is available: reject any RTP packet where hasPadding (P-bit field) is true AND (padLen == 0 || padLen > packetLen – headerLen) before passing it to Pion's packet factories. Alternatively, users can manually apply the patch from pull request #338 (GitHub Advisory, Wiz).