From dbdb86290568e35f11976bde6cb6bbfd3cc0c51f Mon Sep 17 00:00:00 2001
From: seonghobae <8172694+seonghobae@users.noreply.github.com>
Date: Thu, 17 Sep 2026 16:02:17 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=9B=A1=EF=B8=8F=20Sentinel:=20[MEDIUM]=20?=
 =?UTF-8?q?=EC=9E=85=EB=A0=A5=20=EA=B2=80=EC=A6=9D=20=EC=A0=95=EA=B7=9C?=
 =?UTF-8?q?=EC=8B=9D=20=EB=B3=B4=EC=95=88=20=EA=B0=95=ED=99=94?=
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---
 .jules/sentinel.md | 4 ++++
 R/aFIPC.R          | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index a8207a48..dfed5b6b 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -2,3 +2,7 @@
 **Vulnerability:** Unvalidated inputs passed to `if()` statements can cause process crashes (`condition has length > 1`) or unexpected coercion vulnerabilities.
 **Learning:** In R, optional boolean parameters that default to `NULL` should be validated using explicit runtime type validation (e.g., `if (!is.null(flag) && (!is.logical(flag) || length(flag) != 1 || is.na(flag)))`).
 **Prevention:** Always implement explicit runtime type validation for optional boolean parameters.
+## 2026-09-17 - Fix weak regex validation in readline inputs
+**Vulnerability:** Weak regex `^[0-9]+$` on interactive menu prompts allowed integer overflow. Large inputs coerce to `NA` when passed to `as.integer()`, bypassing subsequent checks and causing downstream failures or vulnerabilities.
+**Learning:** In R, validating `readline()` input destined for `as.integer()` requires strictly bounded exact-match regex rather than generic numeric matching to prevent coercion to `NA` from exceeding the 32-bit limit.
+**Prevention:** Always use strictly bounded exact-match regex (e.g., `^[12]$`) for fixed-choice interactive inputs.
diff --git a/R/aFIPC.R b/R/aFIPC.R
index 62546519..918e19b1 100644
--- a/R/aFIPC.R
+++ b/R/aFIPC.R
@@ -141,7 +141,7 @@ autoFIPC <-
       }
       for (attempt in seq_len(3)) {
         n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
-        if (grepl("^[0-9]+$", n)) {
+        if (grepl("^[12]$", n)) {
           return(as.integer(n))
         }
       }
@@ -171,7 +171,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for oldform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }
@@ -390,7 +390,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }