# CVE-2026-59583: Android SIP authentication credentials cleartext disclosure via scheme downgrade

Source: https://junglewise.ai/threats/cve-2026-59583-in-formcredentials-of-sipauhelper-cpp-there-is-a-possible-way-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-59583 · Severity: info · Published 2026-11-10

Android's SIP authentication helper can be downgraded to use cleartext transmission of authentication credentials due to insufficient validation of the authentication scheme. An attacker with network access can intercept and obtain user credentials, potentially leading to account compromise and unauthorized access to SIP-based services.

Technologies: [Google Android](https://junglewise.ai/threats/technologies/android). Vendors: [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2026-59583 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59583 being exploited in the wild.

**How severe is CVE-2026-59583?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Google Android.

**Is there a fix for CVE-2026-59583?** Yes: fixed in Android security patch level 2026-11-05 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-59583 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-59583?** Check whether you run Google Android. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Android security patch level 2026-11-05 or later

## Technical details

The vulnerability exists in FormCredentials of SipAuHelper.cpp, where improper input validation allows an attacker to trigger a scheme downgrade attack. This permits authentication credentials to be disclosed in cleartext over the network. The vulnerability requires system execution privileges but does not need user interaction to exploit.

## Affected products

- Google Android

## Timeline

- 2026-11-10: disclosed

## References

- [https://source.android.com/docs/security/bulletin/pixel/2026/2026-11-01](https://source.android.com/docs/security/bulletin/pixel/2026/2026-11-01)

## Related threats

- [Google Android Bluetooth buffer overflow in acquireMemory](https://junglewise.ai/threats/cve-2026-95405-in-acquirememory-of-bt-bqr-offload-cc-there-is-a-possible-way-to)
- [ST NFC HAL out-of-bounds write in global memory](https://junglewise.ai/threats/cve-2026-95400-in-stnfc-hal-write-of-hal-st21nfc-cc-there-is-a-possible-way-to)
- [Android HEVC decoder buffer overflow in sub_layer_hrd_parameters](https://junglewise.ai/threats/cve-2026-95397-in-sub-layer-hrd-parameters-of-hevc-decoder-there-is-a-possible)
- [Android framework memory exhaustion in message queue handling](https://junglewise.ai/threats/cve-2026-59632-in-respondreceivedmessage-of-mtsmessagecontroller-cpp-there-is-a)
- [Android use-after-free in UssiController connection listener](https://junglewise.ai/threats/cve-2026-59626-in-sendinfo-of-ussicontroller-cpp-there-is-a-possible-way-to)