diff --git a/crates/evm/src/executor/inspector/cheatcodes/parse.rs b/crates/evm/src/executor/inspector/cheatcodes/parse.rs
index 904a3d502574e..d956731304bb3 100644
--- a/crates/evm/src/executor/inspector/cheatcodes/parse.rs
+++ b/crates/evm/src/executor/inspector/cheatcodes/parse.rs
@@ -1,7 +1,7 @@
 use super::{fmt_err, Cheatcodes, Result};
 use crate::abi::HEVMCalls;
 use ethers::{
-    abi::{ParamType, Token},
+    abi::{ethereum_types::FromDecStrErr, ParamType, Token},
     prelude::*,
 };
 use foundry_macros::UIfmt;
@@ -48,32 +48,53 @@ fn parse_token(s: &str, ty: &ParamType) -> Result<Token, String> {
 }
 
 fn parse_int(s: &str) -> Result<U256, String> {
-    // hex string may start with "0x", "+0x", or "-0x" which needs to be stripped for
+    // Only parse hex strings prefixed by 0x or decimal integer strings
+
+    // Hex string may start with "0x", "+0x", or "-0x" which needs to be stripped for
     // `I256::from_hex_str`
     if s.starts_with("0x") || s.starts_with("+0x") || s.starts_with("-0x") {
-        s.replacen("0x", "", 1).parse::<I256>().map_err(|err| err.to_string())
-    } else {
-        match I256::from_dec_str(s) {
+        return s
+            .replacen("0x", "", 1)
+            .parse::<I256>()
+            .map_err(|err| err.to_string())
+            .map(|v| v.into_raw())
+    }
+
+    // Decimal string may start with '+' or '-' followed by numeric characters
+    if s.chars().all(|c| c.is_numeric() || c == '+' || c == '-') {
+        return match I256::from_dec_str(s) {
             Ok(val) => Ok(val),
             Err(dec_err) => s.parse::<I256>().map_err(|hex_err| {
                 format!("could not parse value as decimal or hex: {dec_err}, {hex_err}")
             }),
         }
-    }
-    .map(|v| v.into_raw())
+        .map(|v| v.into_raw())
+    };
+
+    // Throw if string doesn't conform to either of the two patterns
+    Err(ParseI256Error::InvalidDigit.to_string())
 }
 
 fn parse_uint(s: &str) -> Result<U256, String> {
+    // Only parse hex strings prefixed by 0x or decimal numeric strings
+
+    // Hex strings prefixed by 0x
     if s.starts_with("0x") {
-        s.parse::<U256>().map_err(|err| err.to_string())
-    } else {
-        match U256::from_dec_str(s) {
+        return s.parse::<U256>().map_err(|err| err.to_string())
+    };
+
+    // Decimal strings containing only numeric characters
+    if s.chars().all(|c| c.is_numeric()) {
+        return match U256::from_dec_str(s) {
             Ok(val) => Ok(val),
             Err(dec_err) => s.parse::<U256>().map_err(|hex_err| {
                 format!("could not parse value as decimal or hex: {dec_err}, {hex_err}")
             }),
         }
-    }
+    };
+
+    // Throw if string doesn't conform to either of the two patterns
+    Err(FromDecStrErr::InvalidCharacter.to_string())
 }
 
 fn parse_bytes(s: &str) -> Result<Vec<u8>, String> {
@@ -128,7 +149,7 @@ mod tests {
         let decoded = U256::decode(&parsed).unwrap();
         assert_eq!(val, decoded);
 
-        let parsed = parse(pk.strip_prefix("0x").unwrap(), &ParamType::Uint(256)).unwrap();
+        let parsed = parse(pk, &ParamType::Uint(256)).unwrap();
         let decoded = U256::decode(&parsed).unwrap();
         assert_eq!(val, decoded);
 
diff --git a/testdata/repros/Issue5808.t.sol b/testdata/repros/Issue5808.t.sol
index 2c5845a0b1bcb..b721dfa105c02 100644
--- a/testdata/repros/Issue5808.t.sol
+++ b/testdata/repros/Issue5808.t.sol
@@ -9,9 +9,13 @@ contract Issue5808Test is DSTest {
     Vm constant vm = Vm(HEVM_ADDRESS);
 
     function testReadInt() public {
-        string memory json = '["ffffffff","00000010"]';
-        int256[] memory ints = vm.parseJsonIntArray(json, "");
-        assertEq(ints[0], 4294967295);
-        assertEq(ints[1], 10);
+        string memory str1 = '["ffffffff","00000010"]';
+        vm.expectRevert();
+        int256[] memory ints1 = vm.parseJsonIntArray(str1, "");
+
+        string memory str2 = '["0xffffffff","0x00000010"]';
+        int256[] memory ints2 = vm.parseJsonIntArray(str2, "");
+        assertEq(ints2[0], 4294967295);
+        assertEq(ints2[1], 10);
     }
 }