1/3 Bug Advisory Title ESP32-C5 Series Chips Bug Advisory Issue Date 2026/02/26 Advisory Number AR2025-008 Serial Number NA Version V1.0 Issue Summary The following issues have been identified in the ESP32-C5 series chips: Issue 1: PSRAM Reset Hang When ESP32-C5 series chips run ESP-IDF v5.5.1 with PSRAM enabled, CPU or digital reset operations may hang. This triggers a secondary RTC WDT reset. If the rollback feature (CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE, disabled by default) is enabled, this sequence may result in an OTA rollback. Issue 2: AES and SHA Access to PSRAM When ESP32-C5 chips run ESP-IDF v5.5.1, PSRAM data may be corrupted when AES or SHA hardware accesses buffers that are not aligned to a 16-byte boundary. Issue 3: Sleep Coexistence Stability When ESP32-C5 series chips run ESP-IDF v5.5.1 with ESP_WIFI_ENHANCED_LIGHT_SLEEP enabled, task watchdog timeouts may occur during Wi-Fi/BLE/IEEE 802.15.4 dual-mode or tri-mode coexistence, and the system may fail to recover after a CPU reset. Impact Analysis Affected Product Series: These issues affect the ESP32-C5 series of chips. ESP-IDF Affected Versions: Issue 1: PSRAM Reset Hang 2/3 ESP-IDF Branch Affected Commit IDs Affected ESP-IDF Versions master Commits before c467c91 (excluded) No official release yet release/v6.0 Commits before 3df1ee1 (excluded) v6.0-beta1 release/v5.5 Commits before ddb9f5d (excluded) v5.5.1 Issue 2: AES and SHA Access to PSRAM ESP-IDF Branch Affected Commit IDs Affected ESP-IDF Versions master Commits before da1ff70 (excluded) No official release yet release/v6.0 Commits before 145de94 (excluded) v6.0-beta1 release/v5.5 Commits before 86bd3d3 (excluded) v5.5.1 Issue 3: Sleep Coexistence Stability ESP-IDF Branch Affected Commit IDs Affected ESP-IDF Versions master Commits before abd35ae (excluded) No official release yet release/v6.0 Commits before e1d2625 (excluded) v6.0-beta1 release/v5.5 Commits before e3d0b19 (excluded) v5.5.1 Note: ESP32-C5 is supported starting from ESP-IDF v5.5.1. Mitigation ESP-IDF Patched Versions: Issue 1: PSRAM Reset Hang ESP-IDF Branch Fixed Commit IDs Fixed ESP-IDF Versions master c467c91 v6.1 release/v6.0 3df1ee1 v6.0 release/v5.5 ddb9f5d v5.5.2 Issue 2: AES and SHA Access to PSRAM ESP-IDF Branch Fixed Commit IDs Fixed ESP-IDF Versions 3/3 master da1ff70 v6.1 release/v6.0 145de94 v6.0 release/v5.5 86bd3d3 v5.5.2 Issue 3: Sleep Coexistence Stability ESP-IDF Branch Fixed Commit IDs Fixed ESP-IDF Versions master abd35ae v6.1 release/v6.0 e1d2625 v6.0 release/v5.5 e3d0b19 v5.5.2 Recommendations for Application Developers If your application is affected by the issues described above, and you are using an affected ESP-IDF version, it is recommended to upgrade to the patched ESP- IDF version (see the table above). If you encounter any issues during the upgrade process, please provide Espressif with the ESP-IDF version number or Commit ID. We will confirm and handle related matters as soon as possible.