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diff --git a/crypto/objects/obj_dat.c b/crypto/objects/obj_dat.c
index 01cde00e98..c0e55197a0 100644
--- a/crypto/objects/obj_dat.c
+++ b/crypto/objects/obj_dat.c
@@ -443,6 +443,25 @@ int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)
first = 1;
bl = NULL;
+ /*
+ * RFC 2578 (STD 58) says this about OBJECT IDENTIFIERs:
+ *
+ * > 3.5. OBJECT IDENTIFIER values
+ * >
+ * > An OBJECT IDENTIFIER value is an ordered list of non-negative
+ * > numbers. For the SMIv2, each number in the list is referred to as a
+ * > sub-identifier, there are at most 128 sub-identifiers in a value,
+ * > and each sub-identifier has a maximum value of 2^32-1 (4294967295
+ * > decimal).
+ *
+ * So a legitimate OID according to this RFC is at most (32 * 128 / 7),
+ * i.e. 586 bytes long.
+ *
+ * Ref: https://datatracker.ietf.org/doc/html/rfc2578#section-3.5
+ */
+ if (len > 586)
+ goto err;
+
while (len > 0) {
l = 0;
use_bn = 0;