diff --git a/CHANGELOG/feat_openssl_cpu_features.md b/CHANGELOG/feat_openssl_cpu_features.md
new file mode 100644
index 0000000000..8ac04b7e3d
--- /dev/null
+++ b/CHANGELOG/feat_openssl_cpu_features.md
@@ -0,0 +1,3 @@
+## Features
+
+- Log OpenSSL CPU hardware-acceleration feature flags (AES-NI, PCLMULQDQ, AVX, AVX2, SHA, VAES, RDRAND, etc.) at server startup for compliance and audit purposes. Decoded for x86_64, AArch64, and PowerPC; raw string logged for other architectures.
diff --git a/crate/server/src/main.rs b/crate/server/src/main.rs
index 3912aeffa2..1404554cbc 100644
--- a/crate/server/src/main.rs
+++ b/crate/server/src/main.rs
@@ -3,7 +3,7 @@ use std::sync::Arc;
 use cosmian_kms_server::{
     config::{ClapConfig, OpenTelemetryConfig, ServerParams, wizard::run_configure_wizard},
     core::KMS,
-    openssl_providers::safe_openssl_version_info,
+    openssl_providers::{cpu_features_info, safe_openssl_version_info},
     result::{KResult, KResultHelper},
 };
 use cosmian_logger::{TelemetryConfig, TracingConfig, info, tracing_init};
@@ -124,6 +124,7 @@ async fn run() -> KResult<()> {
         env!("CARGO_PKG_VERSION")
     );
     info!("OpenSSL version: {ossl_version}, in {ossl_dir}, number: {ossl_number:x}");
+    info!("{}", cpu_features_info());
 
     // For an explanation of OpenSSL providers,
     //  https://docs.openssl.org/3.1/man7/crypto/#openssl-providers
diff --git a/crate/server/src/openssl_providers.rs b/crate/server/src/openssl_providers.rs
index 1c7bceb03b..0da66e049b 100644
--- a/crate/server/src/openssl_providers.rs
+++ b/crate/server/src/openssl_providers.rs
@@ -1,4 +1,4 @@
-use std::ffi::CStr;
+use std::ffi::{CStr, c_int};
 
 use cosmian_logger::info;
 
@@ -62,6 +62,227 @@ pub fn safe_openssl_version_info() -> (String, String, u64) {
     (version, dir, num)
 }
 
+/// Retrieve human-readable OpenSSL CPU hardware-acceleration feature flags detected
+/// at runtime.
+///
+/// `OpenSSL_version(OPENSSL_CPU_INFO)` (constant `9`, not yet exposed by `openssl-sys`)
+/// returns the raw capability bitmask string that OpenSSL assembled during its own
+/// `OPENSSL_cpuid_setup` call.  This function decodes that bitmask for the known
+/// architectures and falls back to the raw string for unknown ones.
+///
+/// Supported architectures:
+/// - **x86_64**: five packed `u64` words (`OPENSSL_ia32cap_P[0..10]`) covering
+///   CPUID leaves 1, 7.0, 7.1, and 24.  Each bit is mapped to a well-known flag name.
+/// - **AArch64**: a single `u32` word (`OPENSSL_armcap_P`) with ARMv7/v8 extension flags.
+/// - **PowerPC**: a single `u32` word (`OPENSSL_ppccap_P`) with AltiVec / VSX flags.
+/// - **s390x, RISC-V, other**: the raw OpenSSL string is returned verbatim.
+///
+/// # Returns
+///
+/// A `String` such as:
+/// ```text
+/// OpenSSL CPU features (x86_64): AES-NI, PCLMULQDQ, AVX, AVX2, SHA, RDRAND
+/// ```
+#[allow(unsafe_code)]
+#[must_use]
+pub fn cpu_features_info() -> String {
+    // OPENSSL_CPU_INFO = 9; this constant is not yet exposed by openssl-sys.
+    const OPENSSL_CPU_INFO_QUERY: c_int = 9;
+
+    let raw = unsafe {
+        let ptr = openssl_sys::OpenSSL_version(OPENSSL_CPU_INFO_QUERY);
+        if ptr.is_null() {
+            return "OpenSSL CPU features: <unavailable>".to_owned();
+        }
+        match CStr::from_ptr(ptr).to_str() {
+            Ok(s) => s.to_owned(),
+            Err(_) => return "OpenSSL CPU features: <invalid utf-8>".to_owned(),
+        }
+    };
+
+    // Strip optional " env:..." suffix that OpenSSL may append when the
+    // OPENSSL_ia32cap / OPENSSL_armcap env vars override capabilities.
+    // Also strip the leading "CPUINFO: " prefix that OpenSSL_version(9) includes.
+    let raw = raw
+        .split_once(" env:")
+        .map_or(raw.as_str(), |(head, _)| head)
+        .trim_start_matches("CPUINFO: ")
+        .trim()
+        .to_owned();
+
+    if let Some(hex) = raw.strip_prefix("OPENSSL_ia32cap=") {
+        return format!("OpenSSL CPU features (x86_64): {}", decode_ia32cap(hex));
+    }
+    if let Some(hex) = raw.strip_prefix("OPENSSL_armcap=") {
+        return format!("OpenSSL CPU features (aarch64): {}", decode_armcap(hex));
+    }
+    if let Some(hex) = raw.strip_prefix("OPENSSL_ppccap=") {
+        return format!("OpenSSL CPU features (powerpc): {}", decode_ppccap(hex));
+    }
+
+    // s390x, RISC-V, or any future architecture: log the raw string verbatim.
+    format!("OpenSSL CPU features: {raw}")
+}
+
+/// Decode the x86_64 `OPENSSL_ia32cap` five-word hex string into named flags.
+///
+/// Format: `0xW0:0xW1:0xW2:0xW3:0xW4` — five packed `u64` where each word packs
+/// two 32-bit CPUID output registers (low = first register, high = second register):
+///
+/// | Word | Low 32 bits     | High 32 bits    |
+/// |------|-----------------|-----------------|
+/// | 0    | CPUID.1.EDX     | CPUID.1.ECX     |
+/// | 1    | CPUID.7.0.EBX   | CPUID.7.0.ECX   |
+/// | 2    | CPUID.7.0.EDX   | CPUID.7.1.EAX   |
+/// | 3    | CPUID.7.1.EDX   | CPUID.7.1.EBX   |
+/// | 4    | CPUID.7.1.ECX   | CPUID.24.0.EBX  |
+fn decode_ia32cap(hex: &str) -> String {
+    let words: Vec<u64> = hex
+        .split(':')
+        .map(|s| u64::from_str_radix(s.trim_start_matches("0x"), 16).unwrap_or(0))
+        .collect();
+
+    if words.len() < 5 {
+        return format!("<parse error: {hex}>");
+    }
+
+    // (word_index, bit_position_within_word, display_name)
+    // Bits 0-31 map to the low u32 register; bits 32-63 to the high u32 register.
+    #[rustfmt::skip]
+    const FLAGS: &[(usize, u32, &str)] = &[
+        // Word 0 — CPUID leaf 1, EDX (bits 0-31) + ECX (bits 32-63)
+        (0, 23, "MMX"),
+        (0, 25, "SSE"),
+        (0, 26, "SSE2"),
+        (0, 32, "SSE3"),
+        (0, 33, "PCLMULQDQ"),
+        (0, 41, "SSSE3"),
+        (0, 44, "FMA"),
+        (0, 51, "SSE4.1"),
+        (0, 52, "SSE4.2"),
+        (0, 54, "MOVBE"),
+        (0, 55, "POPCNT"),
+        (0, 57, "AES-NI"),
+        (0, 58, "XSAVE"),
+        (0, 60, "AVX"),
+        (0, 62, "RDRAND"),
+        // Word 1 — CPUID leaf 7 subleaf 0, EBX (bits 0-31) + ECX (bits 32-63)
+        (1,  3, "BMI1"),
+        (1,  5, "AVX2"),
+        (1,  8, "BMI2"),
+        (1, 16, "AVX512F"),
+        (1, 17, "AVX512DQ"),
+        (1, 18, "RDSEED"),
+        (1, 19, "ADX"),
+        (1, 21, "AVX512IFMA"),
+        (1, 28, "AVX512CD"),
+        (1, 29, "SHA"),
+        (1, 30, "AVX512BW"),
+        (1, 31, "AVX512VL"),
+        (1, 33, "AVX512VBMI"),
+        (1, 38, "AVX512VBMI2"),
+        (1, 40, "GFNI"),
+        (1, 41, "VAES"),
+        (1, 42, "VPCLMULQDQ"),
+        (1, 43, "AVX512VNNI"),
+        (1, 44, "AVX512BITALG"),
+        (1, 46, "AVX512VPOPCNTDQ"),
+        // Word 2 — CPUID.7.0.EDX (bits 0-31) + CPUID.7.1.EAX (bits 32-63)
+        (2,  2, "AVX512-4VNNIW"),
+        (2,  3, "AVX512-4FMAPS"),
+        (2,  8, "AVX512VP2INTERSECT"),
+        (2, 36, "AVX-VNNI"),
+        (2, 37, "AVX512-BF16"),
+        // Word 3 — CPUID.7.1.EDX (bits 0-31) + CPUID.7.1.EBX (bits 32-63)
+        (3, 32, "SHA512"),
+        (3, 33, "SM3"),
+        (3, 34, "SM4"),
+        // Word 4 — CPUID.7.1.ECX (bits 0-31) + CPUID.24.0.EBX (bits 32-63, AVX10)
+        (4,  4, "AVX-NE-CONVERT"),
+        (4,  5, "AVX-VNNI-INT8"),
+    ];
+
+    let enabled: Vec<&str> = FLAGS
+        .iter()
+        .filter(|&&(w, bit, _)| (words[w] >> bit) & 1 == 1)
+        .map(|&(_, _, name)| name)
+        .collect();
+
+    if enabled.is_empty() {
+        "<none>".to_owned()
+    } else {
+        enabled.join(", ")
+    }
+}
+
+/// Decode the AArch64 `OPENSSL_armcap` single-word hex string into named flags.
+///
+/// The value is a 32-bit bitmask (`OPENSSL_armcap_P`) populated by the kernel
+/// auxiliary vector (AT_HWCAP / AT_HWCAP2) during `OPENSSL_cpuid_setup`.
+fn decode_armcap(hex: &str) -> String {
+    let cap = u32::from_str_radix(hex.trim_start_matches("0x"), 16).unwrap_or(0);
+
+    #[rustfmt::skip]
+    const FLAGS: &[(u32, &str)] = &[
+        (1 <<  0, "NEON"),
+        (1 <<  2, "ARMV8_AES"),
+        (1 <<  3, "ARMV8_SHA1"),
+        (1 <<  4, "ARMV8_SHA256"),
+        (1 <<  5, "ARMV8_PMULL"),
+        (1 <<  6, "ARMV8_SHA512"),
+        (1 <<  8, "ARMV8_RNG"),
+        (1 <<  9, "ARMV8_SM3"),
+        (1 << 10, "ARMV8_SM4"),
+        (1 << 11, "ARMV8_SHA3"),
+        (1 << 12, "ARMV8_UNROLL8_EOR3"),
+        (1 << 13, "ARMV8_SVE"),
+        (1 << 14, "ARMV8_SVE2"),
+        (1 << 16, "ARMV8_UNROLL12_EOR3"),
+    ];
+
+    let enabled: Vec<&str> = FLAGS
+        .iter()
+        .filter(|&&(mask, _)| cap & mask != 0)
+        .map(|&(_, name)| name)
+        .collect();
+
+    if enabled.is_empty() {
+        "<none>".to_owned()
+    } else {
+        enabled.join(", ")
+    }
+}
+
+/// Decode the PowerPC `OPENSSL_ppccap` single-word hex string into named flags.
+///
+/// The value is a 32-bit bitmask (`OPENSSL_ppccap_P`) populated during
+/// `OPENSSL_cpuid_setup` from the Linux auxiliary vector.
+fn decode_ppccap(hex: &str) -> String {
+    let cap = u32::from_str_radix(hex.trim_start_matches("0x"), 16).unwrap_or(0);
+
+    #[rustfmt::skip]
+    const FLAGS: &[(u32, &str)] = &[
+        (1 << 0, "PPC_FPU64"),
+        (1 << 1, "PPC_ALTIVEC"),
+        (1 << 2, "PPC_CRYPTO207"),
+        (1 << 3, "PPC_FPU"),
+        (1 << 4, "PPC_MADD300"),
+        (1 << 5, "PPC_MFTB"),
+    ];
+
+    let enabled: Vec<&str> = FLAGS
+        .iter()
+        .filter(|&&(mask, _)| cap & mask != 0)
+        .map(|&(_, name)| name)
+        .collect();
+
+    if enabled.is_empty() {
+        "<none>".to_owned()
+    } else {
+        enabled.join(", ")
+    }
+}
+
 /// Initialize OpenSSL providers for test environments.
 ///
 /// In non-FIPS mode with OpenSSL >= 3.0: loads the legacy provider for old PKCS#12 formats.