Google Android: Denial of service via unbounded recursion in SIP stack
Summary
CVE-2026-59595 affects the SIP signalling code in DecodeHeaderComponent (SipStack.cpp) on Android devices. Unbounded mutual recursion can exhaust the stack, which can crash the affected component and disrupt calls or messaging. Per the CVSS vector provided, a remote attacker needs no privileges or user interaction, and the impact is limited to availability. The component and reachability on Pixel devices are not yet confirmed by Google.
Affected
- Google Android (Pixel devices)
- Affected component: unverified. The CVE record lists the Android kernel, but the description points to SipStack.cpp (userspace SIP code).
- Affected versions: Unknown.
Fixed in
- Security patch level 2026-11-05 or later (Pixel Update Bulletin, November 2026).
- Per-CVE mapping to this patch level: not confirmed by Google in the sources reviewed.
Workaround
Unknown. No vendor workaround documented.
Exploitation
- No known exploitation in the wild found.
- Not listed in CISA KEV according to an aggregator.
- No public proof of concept found.
Our recommendation
- Install the November 2026 update (security patch level 2026-11-05 or later) on all managed Pixel devices, prioritising phones used for business calls.
- Verify the patch level on each device in your mobile device management or manually.
- Monitor the Google bulletin for a confirmed per-CVE mapping and the NVD analysis.
- Replace devices that no longer receive security updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Pixel Update Bulletin, November 2026 source.android.com
- CVE Record CVE-2026-59595 www.cve.org
- Android Security Bulletin, November 2026 source.android.com
- CVE-2026-59595 description mirror cve.threatint.com
- CVE-2026-59595 status aggregator www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 04:55.
Original description (NVD)
In DecodeHeaderComponent of SipStack.cpp, there is a possible way to trigger stack exhaustion via unbounded mutual recursion due to a resource exhaustion. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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