CVE-2026-0130: Android RTCP Buffer Overflow Information Disclosure Vulnerability

Technical summary

The vulnerability resides in RtcpChunk::decodeRtcpChunk, a function responsible for parsing Real-Time Control Protocol (RTCP) packets in Android's media subsystem. The function contains a heap buffer overflow condition that permits out-of-bounds memory reads. This violates safe memory access boundaries (CWE-122: Heap-based Buffer Overflow) and represents an improper input validation issue (CWE-125: Out-of-bounds Read). The attack requires network-level packet delivery combined with user interaction—specifically, the user must engage with or accept an incoming media session containing the malicious RTCP chunk. No kernel-level privileges or local access are prerequisites. The leaked data is confined to what exists in adjacent heap memory at runtime and does not directly enable code execution.

Business impact

For most organizations, the immediate business risk is contained. The vulnerability enables unauthorized reading of in-memory data belonging to the affected application or process, which could include session tokens, decryption keys, or user identifiers if present in heap memory during exploitation. For users of Android devices running vulnerable builds, the principal concern is privacy leakage during audio or video communications. Organizations operating media gateways, teleconference infrastructure, or VoIP services that accept RTCP streams on behalf of Android clients should evaluate whether their deployment patterns could expose this condition. The required user interaction significantly lowers mass-exploitation risk compared to unauthenticated network trigger vectors.

Affected systems

Google Android is the affected platform. The vulnerability applies to Android builds that include the vulnerable RtcpChunk decoder and are reachable by network-sourced RTCP packets—typically devices capable of making or receiving voice, video, or real-time media calls. The exact version range and affected Android release lines should be confirmed against Google's security bulletin for CVE-2026-0130. Devices running recent Android versions are generally more likely to have received patches; older or unpatched devices remain at risk. Non-Android platforms and devices without real-time media communication capabilities are not affected.

Exploitability

Exploitation is feasible but constrained by two factors: (1) the attacker must send a network packet, which requires network reachability to the target device—typically achievable over the internet for devices with active network stacks; (2) user interaction is mandatory, meaning a user must accept, initiate, or maintain an active media session that processes the malicious RTCP packet. This eliminates wormable or fully remote mass-exploitation scenarios. An attacker would need to either intercept legitimate media traffic, participate in a call or conference with the target, or social-engineer the target into accepting a call from a malicious endpoint. No special privileges or escalation is required post-interaction. Given the low CVSS score (3.5) and non-critical nature of the leak, this is not currently tracked in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Remediation

Organizations and individual users should patch Android devices to a build that includes the fix for CVE-2026-0130. Google's Android security team will publish a patched version; consult the official Android Security & Privacy Year in Review or monthly security bulletin for the specific build number and rollout timeline. Updates may arrive via automatic over-the-air (OTA) release or through carrier/device-manufacturer channels depending on your device model and Android version. In the interim, users can reduce exposure by avoiding untrusted or unsolicited media calls, calls from unknown contacts, or calls routed through unverified third-party communication platforms. Disabling real-time media features in high-risk scenarios or segregating untrusted communications to secondary devices provides additional mitigation.

Patch guidance

Verify the latest Android security bulletin from Google to identify the patched build version(s) for your device model and Android version. Most Pixel and reference-implementation devices receive timely over-the-air updates; other manufacturers and carriers may introduce delays. Check your device's Settings > About Phone > System Update to initiate a manual update check. If your device is no longer eligible for security updates (end-of-support reached), you may need to plan for device replacement or accept the residual risk alongside other known vulnerabilities. Test patches in a non-critical environment first if you manage enterprise Android deployments.

Detection guidance

Network-level detection is difficult because the vulnerability manifests as a malformed RTCP packet structure, not an easily fingerprinted payload. Intrusion detection systems (IDS) tuned to RTCP anomalies may flag packets with incorrect buffer sizes or out-of-range field values, but signature coverage for this specific issue is unlikely without vendor-provided rules. Endpoint detection would require logging or monitoring of the Android media framework's memory access patterns, which is not practical for most environments. The best practical detection approach is vulnerability scanning: use MDM (Mobile Device Management) or Mobile Threat Defense (MTD) solutions to identify unpatched Android devices and enforce remediation. Server-side mitigation (e.g., gateways filtering malformed RTCP) can reduce blast radius if you control media infrastructure.

Why prioritize this

CVE-2026-0130 warrants routine but not urgent remediation. Its low CVSS score (3.5), reliance on user interaction, and confidentiality-only impact (no integrity or availability risk) place it below critical and high-severity flaws in prioritization. However, it should still be addressed within your standard patch cadence (typically 30–60 days for Android security updates) because it involves information disclosure and affects a popular consumer platform. Organizations should prioritize patching of company-managed or BYOD Android devices if users frequently engage in sensitive communications. Vulnerabilities with higher severity or active exploitation should be patched first.

Risk score, explained

The CVSS v3.1 score of 3.5 reflects a low-severity vulnerability: Attack Vector is Network (accessible remotely), Attack Complexity is Low (no special conditions required beyond user interaction), Privileges Required is Low (a user account suffices), User Interaction is Required (the user must accept or engage with the malicious communication), Scope is Unchanged (impact confined to the vulnerable component), and Confidentiality impact is Low (some information leakage, not wholesale data theft). Integrity and Availability are unaffected. The mandatory user interaction component is critical to the low score; without it, the vulnerability would likely score higher. The score does not account for non-technical factors such as public awareness or social engineering difficulty.

Frequently asked questions