diff --git a/lib/libalpm/alpm.c b/lib/libalpm/alpm.c
index 32b93b3b..e71cb02a 100644
--- a/lib/libalpm/alpm.c
+++ b/lib/libalpm/alpm.c
@@ -38,7 +38,7 @@ alpm_handle_t SYMEXPORT *alpm_initialize(const char *root, const char *dbpath,
 	alpm_errno_t myerr;
 	const char *lf = "db.lck";
 	char *hookdir;
-	size_t lockfilelen;
+	size_t hookdirlen, lockfilelen;
 	alpm_handle_t *myhandle = _alpm_handle_new();
 
 	if(myhandle == NULL) {
@@ -54,8 +54,9 @@ alpm_handle_t SYMEXPORT *alpm_initialize(const char *root, const char *dbpath,
 	/* to concatenate myhandle->root (ends with a slash) with SYSHOOKDIR (starts
 	 * with a slash) correctly, we skip SYSHOOKDIR[0]; the regular +1 therefore
 	 * disappears from the allocation */
-	MALLOC(hookdir, strlen(myhandle->root) + strlen(SYSHOOKDIR), goto nomem);
-	sprintf(hookdir, "%s%s", myhandle->root, &SYSHOOKDIR[1]);
+	hookdirlen = strlen(myhandle->root) + strlen(SYSHOOKDIR);
+	MALLOC(hookdir, hookdirlen, goto nomem);
+	snprintf(hookdir, hookdirlen, "%s%s", myhandle->root, &SYSHOOKDIR[1]);
 	myhandle->hookdirs = alpm_list_add(NULL, hookdir);
 
 	/* set default database extension */
diff --git a/lib/libalpm/be_local.c b/lib/libalpm/be_local.c
index b4a7c35a..c9929181 100644
--- a/lib/libalpm/be_local.c
+++ b/lib/libalpm/be_local.c
@@ -677,7 +677,7 @@ char *_alpm_local_db_pkgpath(alpm_db_t *db, alpm_pkg_t *info,
 	len = strlen(dbpath) + strlen(info->name) + strlen(info->version) + 3;
 	len += filename ? strlen(filename) : 0;
 	MALLOC(pkgpath, len, RET_ERR(db->handle, ALPM_ERR_MEMORY, NULL));
-	sprintf(pkgpath, "%s%s-%s/%s", dbpath, info->name, info->version,
+	snprintf(pkgpath, len, "%s%s-%s/%s", dbpath, info->name, info->version,
 			filename ? filename : "");
 	return pkgpath;
 }
@@ -1164,7 +1164,7 @@ int _alpm_local_db_remove(alpm_db_t *db, alpm_pkg_t *info)
 				/* file path is too long to remove, hmm. */
 				ret = -1;
 			} else {
-				sprintf(name, "%s/%s", pkgpath, dp->d_name);
+				snprintf(name, PATH_MAX, "%s/%s", pkgpath, dp->d_name);
 				if(unlink(name)) {
 					ret = -1;
 				}
diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c
index e47cdefe..c5f63022 100644
--- a/lib/libalpm/be_sync.c
+++ b/lib/libalpm/be_sync.c
@@ -48,7 +48,7 @@ static char *get_sync_dir(alpm_handle_t *handle)
 	struct stat buf;
 
 	MALLOC(syncpath, len, RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
-	sprintf(syncpath, "%s%s", handle->dbpath, "sync/");
+	snprintf(syncpath, len, "%s%s", handle->dbpath, "sync/");
 
 	if(stat(syncpath, &buf) != 0) {
 		_alpm_log(handle, ALPM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c
index 38d28c6c..efa22501 100644
--- a/lib/libalpm/conflict.c
+++ b/lib/libalpm/conflict.c
@@ -612,8 +612,9 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle,
 			/* check if all files of the dir belong to the installed pkg */
 			if(!resolved_conflict && S_ISDIR(lsbuf.st_mode)) {
 				alpm_list_t *owners;
-				char *dir = malloc(strlen(relative_path) + 2);
-				sprintf(dir, "%s/", relative_path);
+				size_t dir_len = strlen(relative_path) + 2;
+				char *dir = malloc(dir_len);
+				snprintf(dir, dir_len, "%s/", relative_path);
 
 				owners = alpm_db_find_file_owners(handle->db_local, dir);
 				if(owners) {
diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index d7431bd6..d949b645 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -417,14 +417,14 @@ const char *_alpm_db_path(alpm_db_t *db)
 		if(db->status & DB_STATUS_LOCAL) {
 			pathsize = strlen(dbpath) + strlen(db->treename) + 2;
 			CALLOC(db->_path, 1, pathsize, RET_ERR(db->handle, ALPM_ERR_MEMORY, NULL));
-			sprintf(db->_path, "%s%s/", dbpath, db->treename);
+			snprintf(db->_path, pathsize, "%s%s/", dbpath, db->treename);
 		} else {
 			const char *dbext = db->handle->dbext;
 
 			pathsize = strlen(dbpath) + 5 + strlen(db->treename) + strlen(dbext) + 1;
 			CALLOC(db->_path, 1, pathsize, RET_ERR(db->handle, ALPM_ERR_MEMORY, NULL));
 			/* all sync DBs now reside in the sync/ subdir of the dbpath */
-			sprintf(db->_path, "%ssync/%s%s", dbpath, db->treename, dbext);
+			snprintf(db->_path, pathsize, "%ssync/%s%s", dbpath, db->treename, dbext);
 		}
 		_alpm_log(db->handle, ALPM_LOG_DEBUG, "database path for tree %s set to %s\n",
 				db->treename, db->_path);
diff --git a/lib/libalpm/signing.c b/lib/libalpm/signing.c
index b2b31039..0bb7d0a6 100644
--- a/lib/libalpm/signing.c
+++ b/lib/libalpm/signing.c
@@ -316,7 +316,7 @@ static int key_search_keyserver(alpm_handle_t *handle, const char *fpr,
 	 * key fingerprint with 0x, or the lookup will fail. */
 	fpr_len = strlen(fpr);
 	MALLOC(full_fpr, fpr_len + 3, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
-	sprintf(full_fpr, "0x%s", fpr);
+	snprintf(full_fpr, fpr_len + 3, "0x%s", fpr);
 
 	gpg_err = gpgme_new(&ctx);
 	CHECK_ERR();
@@ -816,7 +816,7 @@ char *_alpm_sigpath(alpm_handle_t *handle, const char *path)
 	}
 	len = strlen(path) + 5;
 	CALLOC(sigpath, len, sizeof(char), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
-	sprintf(sigpath, "%s.sig", path);
+	snprintf(sigpath, len, "%s.sig", path);
 	return sigpath;
 }
 
@@ -1085,7 +1085,7 @@ static int parse_subpacket(alpm_handle_t *handle, const char *identifier,
 					return -1;
 				}
 				for (i = 0; i < 8; i++) {
-					sprintf(&key[i * 2], "%02X", sig[spos + i + 1]);
+					snprintf(&key[i * 2], 3, "%02X", sig[spos + i + 1]);
 				}
 				*keys = alpm_list_add(*keys, strdup(key));
 				break;
diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index 1653b4b2..cd2f17b0 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -314,6 +314,7 @@ static int compute_download_size(alpm_pkg_t *newpkg)
 	off_t size = 0;
 	alpm_handle_t *handle = newpkg->handle;
 	int ret = 0;
+	size_t fnamepartlen = 0;
 
 	if(newpkg->origin != ALPM_PKG_FROM_SYNCDB) {
 		newpkg->infolevel |= INFRQ_DSIZE;
@@ -331,8 +332,9 @@ static int compute_download_size(alpm_pkg_t *newpkg)
 		goto finish;
 	}
 
-	CALLOC(fnamepart, strlen(fname) + 6, sizeof(char), return -1);
-	sprintf(fnamepart, "%s.part", fname);
+	fnamepartlen = strlen(fname) + 6;
+	CALLOC(fnamepart, fnamepartlen, sizeof(char), return -1);
+	snprintf(fnamepart, fnamepartlen, "%s.part", fname);
 	fpath = _alpm_filecache_find(handle, fnamepart);
 	if(fpath) {
 		struct stat st;
diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c
index 5e2458e9..4892820b 100644
--- a/lib/libalpm/trans.c
+++ b/lib/libalpm/trans.c
@@ -99,7 +99,7 @@ static alpm_list_t *check_arch(alpm_handle_t *handle, alpm_list_t *pkgs)
 			const char *pkgver = pkg->version;
 			size_t len = strlen(pkgname) + strlen(pkgver) + strlen(pkgarch) + 3;
 			MALLOC(string, len, RET_ERR(handle, ALPM_ERR_MEMORY, invalid));
-			sprintf(string, "%s-%s-%s", pkgname, pkgver, pkgarch);
+			snprintf(string, len, "%s-%s-%s", pkgname, pkgver, pkgarch);
 			invalid = alpm_list_add(invalid, string);
 		}
 	}
diff --git a/src/pacman/callback.c b/src/pacman/callback.c
index 76527e40..27a18a4f 100644
--- a/src/pacman/callback.c
+++ b/src/pacman/callback.c
@@ -805,7 +805,7 @@ static void draw_pacman_progress_bar(struct pacman_progress_bar *bar)
 		// fname + digits +  ( /) + \0
 		size_t needed = strlen(fname) + (digits * 2) + 4 + 1;
 		char *name = malloc(needed);
-		sprintf(name, "%s (%*zu/%*zu)", fname, digits, bar->downloaded, digits, bar->howmany);
+		snprintf(name, needed, "%s (%*zu/%*zu)", fname, digits, bar->downloaded, digits, bar->howmany);
 		free(fname);
 		fname = name;
 	}
diff --git a/src/pacman/package.c b/src/pacman/package.c
index 95d0c4c4..ead623a8 100644
--- a/src/pacman/package.c
+++ b/src/pacman/package.c
@@ -433,7 +433,7 @@ void dump_pkg_backups(alpm_pkg_t *pkg, unsigned short cols)
 		if(!line) {
 			goto cleanup;
 		}
-		sprintf(line, "%s%s %s", root, backup->name, value);
+		snprintf(line, needed, "%s%s %s", root, backup->name, value);
 		text = alpm_list_add(text, line);
 	}
 
diff --git a/src/pacman/query.c b/src/pacman/query.c
index 2e935fc6..1a504038 100644
--- a/src/pacman/query.c
+++ b/src/pacman/query.c
@@ -66,7 +66,7 @@ static int search_path(char **filename, struct stat *bufptr)
 			free(envpath);
 			return -1;
 		}
-		sprintf(fullname, "%s/%s", path, *filename);
+		snprintf(fullname, plen + flen + 2, "%s/%s", path, *filename);
 
 		if(lstat(fullname, bufptr) == 0) {
 			free(*filename);